Do Hostile Media Perceptions Constrain Minipublics? A Study of how Oregon Voters Perceive Citizens’ Statements

The deliberative quality of a minipublic often depends on its ability to inform the opinions of a larger public. The Citizens’ Initiative Review (CIR) aims to do so by producing a Citizens’ Statement, which we conceptualize as a deliberative form of mass media. Like any mass media, this Statement can only influence public opinion to the extent that citizens consider it unbiased and credible. Hostile media perceptions often prevent favorable evaluations of media content, but no prior work has considered whether these perceptions could undermine the output of deliberative minipublics. To examine that possibility, we analyze online survey data on Oregon voters’ assessments of two 2014 Citizens’ Statements. Results showed that voters’ evaluations of the Statements were unaffected by hostile media perceptions. Assessments were more favorable when voters had confidence in their knowledge of the CIR’s design, process, and participants. Evaluations also were more positive for those voters with greater faith in deliberation’s capacity to render considered judgments. We elaborate on these findings in our discussion section and consider their theoretical and practical implications for implementing minipublics and bolstering their deliberative quality.

Minipublics are small-scale forums that engage representative bodies of randomly selected citizens in structured, informed, and facilitated deliberation about issues of public interest (Fung, 2003;Goodin & Dryzek, 2006;Grönlund et al., 2014;Ryan & G. Smith, 2014). Though different types have distinct functions (Setälä & G. Smith, 2018), the minipublics to which we refer herein are those that seek to 'shape decision-making indirectly by inserting their recommendations into the citizenry's public deliberations' (Lafont, 2015, p. 56;Niemeyer, 2011). Such minipublics often produce reports that include policyrelevant factual information, pro and con arguments, and justifications for those arguments. These minipublics are meant to serve as 'trusted information proxies' for citizens seeking to form opinions or make decisions about public policies (Bächtiger, Setälä & Grönlund 2014;MacKenzie & Warren, 2012;Niemeyer, 2014;Warren & Gastil, 2015).
The Citizens' Initiative Review (CIR) is one such minipublic that endeavors to help voters in the state of Oregon . A deliberative forum authorized by the Oregon state government and run by a separate neutral convening organization, Healthy Democracy, the CIR convenes 20-24 randomly selected citizens to deliberate on a proposed ballot measure slated to appear on Oregon voters' ballots in an upcoming statewide election. After four-to-five days of deliberation, these citizen panelists author a one-page analysis of the measure. The Secretary of State then places this "Citizens' Statement" in the official Voters' Pamphlet mailed to all registered voters.
The inclusion of the printed Statement in the massmailed Pamphlet renders it a form of mass media. It is a message transmitted through a ' communication channel used to simultaneously reach a large number of people' (Wimmer & Dominick, 2013, p. 2; e.g., see Pfau et al., 1990).
More precisely, the Statement is a form of ' deliberative media,' which are mass media that not only reach large numbers of citizens but also provide information on issues of public interest while aiming to inspire deliberative behaviors by their audience (Carcasson & Sprain, 2010;Wessler, 2008aWessler, , 2008b. Deliberative media share the same systemic influence goals as minipublics, which is why minipublics like the CIR use them Felicetti, Niemayer & Curato, 2016;Ingham & Levin, 2018a, 2018bSmith, 2012;Warren & Pearse, 2008).
Prior research on deliberative media has assessed the extent to which their content reflects normative standards (Wessler, 2008a(Wessler, , 2008b and, largely, has been limited to non-experimental content analyses (Rinke et al., 2013;Wessler & Rinke, 2014; for a notable exception, see van der Wurff, De Swert & Lecheler, 2018). However, echoing Curato and Böker (2016), the deliberative quality of these media also depends on their external reception. This suggests the need for an experimental approach in which voters are exposed to different media.
Research has shown the CIR to be of high deliberative quality (Knobloch et al., 2013. Past studies have found the Citizens' Statement can inform voters' opinions and augment different aspects of their deliberative capacity (Gastil et al., , 2016Gastil & Knobloch, 2010;Knobloch et al., 2014;Knobloch, Barthel and Gastil, 2020;Már & Gastil, 2020). The Statements also function as a ' deliberative cue' to offset some of the more detrimental effects of overreliance on partisan cues (Gastil et al., 2018;Már & Gastil, 2020).
Deliberative media like the Statement, however, can only reliably inform opinions to the extent citizens perceive them to be unbiased and credible (Morris, 2007;Rahman, 2014).
Decreasing public trust in mass media (Rainie, Keeter and Perrin, 2019;Swift, 2016) and increasing hyperpartisanship (Pew Research Center, 2017) may undermine these perceptions and reduce the deliberative efficacy of a minipublic like the CIR. Though Már and Gastil (2020) found the Statement can inform voters' opinions across partisan identities and prior attitudes, no prior work has considered how voters' distrust of media may affect perceptions of the Statement's bias.
To fill this research gap, we evaluated the deliberative quality of two 2014 CIRs through a secondary analysis of voters' perceptions of two 2014 Citizens' Statements. We examined whether these perceptions demonstrate the occurrence of hostile media perceptions (HMP) as a result of reading the Statement.
We aim to enrich this literature by studying whether HMP occur for the CIR's Citizens' Statement. Unlike conventional news, this unique message to voters is written by citizens as a product of their deliberation, then gets transmitted to their peers by their government. If HMP occurs, voters will perceive the Statement as biased against their preexisting preferences, negatively impacting its perceived credibility and reducing the CIR's deliberative impact as a result.
We also use an HMP approach to test other predictions from deliberative theory. Prior work suggests that voters who understand a minipublic's design and purpose would view its findings as credible (Cutler et al., 2008;Fournier et al., 2011;Gastil et al., 2016;Niessen, 2019;Warren & Gastil, 2015; for a notable exception, see Devillers et al., 2020). Voters with more faith in the efficacy of public deliberation should give more credence to messages generated by deliberative bodies (Fung, 2005;White, 2010). Such beliefs can be strengthened by direct participation in deliberation (Brinker, Gastil and Richards, 2015;, but no prior work has considered how they might shape perceptions of deliberative outputs. Using the HMP model, we test the extent to which these factors shape the credibility of the CIR's Statements.

Research context
Our unique research setting warrants a fuller description of the CIR before framing it in the terms of HMP theory. In 2009, the Oregon state legislature authorized the pilot test of a new method to improve direct democracy in statewide elections. Every two years in Oregon, citizens gather signatures to place initiatives on the ballot, which ask voters to approve or reject proposed laws on any subject, like tax policy or environmental regulation. The legislative intent of the CIR was to provide Oregon voters with impartial information on these statewide ballot measures by giving them a page of information written by their peers.
The inaugural CIR, held in 2010, gathered a stratified random sample of 24 Oregon voters, all of whom had expenses covered in addition to a modest honorarium. Participants then spent five days studying a proposed criminal sentencing law. These citizen panelists heard testimony from advocates and opponents of the proposal, engaged in question-and-answer sessions with background experts, and enjoyed ample time for small-group deliberation. In the final two days of the process, panelists wrote their one-page Citizens' Statement. This began with a summary of 'Key Findings' about the proposed law, which consisted of neutral information about the law that the panelists considered important for voters to know. Separate sections presented what the panelists considered to be the strongest arguments for and against passing the law. Before the 2010 general election, the Oregon Secretary of State placed this Citizens' Statement in the Voters' Pamphlet, where it appeared after a technical summary and fiscal impact statement for the measure. Following the first round of CIRs, in 2011 the Oregon legislature created the CIR Commission to make this a regular part of the electoral process. Since its inception, the CIR has been held seven times in Oregon, eight times in other US states, and most recently in Finland and Switzerland .
The CIR feeds into the stream of deliberative theory and practice in many ways. Modeled on the Citizens' Jury first created in the 1970s (Crosby & Nethercutt, 2005), it resembles many other small deliberative bodies tasked with analyzing a policy proposal and drafting an issue summary and/or recommendation. It also fits within the larger set of minipublics (Grönlund, Bächtiger & Setälä, 2014), which convene random samples of citizens to deliberate on one or more issues, then report their findings to elected officials, agencies, or the general public (Farrell & Suiter, 2019;Fishkin, 2018). What distinguishes the CIR is its legal authority to provide a timely report to an electorate via its Citizens' Statements. In this sense, the CIR aims to use its own internal deliberation as a way to make the public a bit more deliberative on a mass scale (MacKenzie & Warren, 2012;Warren & Gastil, 2015).
The two instances of the CIR used in this study were convened in Salem, Oregon in August 2014 to provide statements on ballot measures appearing in the November general election. Measure 90 (August 17-20) proposed replacing the conventional party primary system with a 'top-two' primary, in which the two candidates with the most votes advance to the general election, regardless of their political party. Measure 92 (August 21-24) proposed mandating that certain foods including genetically modified organisms (GMOs) be labeled as such. Both measures ultimately failed: 68% of voters opposed Measure 90, as did 50.5% of those voting on Measure 92. (These and other details on the measures are available at Ballotpedia.com.) Because Oregon conducts its elections by mail, every registered Oregon voter was sent both a printed ballot and the official Voters' Pamphlet several weeks before Election Day. For both Measures 90 and 92, the centerpiece of the 2014 Oregon Citizens' Statement was a bulleted list of Key Findings. Below that were two boxes: On the left was the 'Citizen Statement in Support of the Measure' (pro arguments), and on the right stood a 'Citizen Statement in Opposition to the Measure' (con arguments). Above these were two descriptive paragraphs to provide context. The first, titled 'Citizens' Initiative Review of Ballot Measure 92,' explained that 'the opinions expressed in this statement are those of the members of a citizen panel and were developed through the Citizens' Initiative Review process as adopted by the Oregon State Legislature.' It further specified that these views are 'NOT official opinions or positions endorsed by the State of Oregon or any government agency,' nor does the CIR serve as ' a judge of the constitutionality or legality of any ballot measure.' Below that was a 'Description of the Citizens' Initiative Review,' which offered this description of the CIR process: 'This statement was developed by an independent panel of 20 Oregon voters, chosen at random from the voting population of Oregon, and balanced to fairly reflect the state's voting population. The panel has issued this statement after three and a half days of hearings and deliberation. This statement has not been edited nor has the content been altered.'

theory and hypotheses
Our core hypotheses derive from HMP theory. We extend that theory with additional hypotheses about how knowledge and attitudes toward minipublics might affect perceptions of deliberative media. We present each of these hypotheses in relation to the Oregon CIR.
hostile Media Perceptions and the citizens' statement Gunther and Schmitt (2004) summarize the core proposition of HMP theory as 'the tendency for partisans to judge mass media coverage as unfavorable to their own point of view' and favorable to opposing views (p. 55). The central claim of HMP is that people with preexisting views on an issue will perceive neutral or balanced mass media content about that issue as biased against their views. Considerable research has advanced HMP theory since its inception (Vallone, 1985; for a review, see Perloff, 2015). Studies have examined the nature and limits of this phenomenon on various groups' perceptions of different mass media and produced robust evidence in support of the theory (Arceneaux, Johnson and Murphy, 2012;Ariyanto, Hornsey & Gallois, 2007;Arpan & Raney, 2003;Choi, Yang and Chang, 2009;Christen, Kannaovakun & Gunther, A. 2002;Eveland & Shah, 2003;Feldman, 2011;Giner-Sorolla & Chaiken, 1994;Gunther & Liebhart, 2006;Hwang, Pan and Sun, 2008;Matheson & Dursun, 2001;Moehler & Singh, 2011;Morris, 2007;Perloff, 1989;Richardson et al., 2008;Schmitt, Gunther and Liebhart, 2004;Tsfati, 2007;Tsfati & J. Cohen, 2005; for a metaanalysis, see Hansen & Kim, 2011).
The first study to test the HMP perspective compared Arab and Israeli students' perceptions of network television news broadcasts on Arab-Israeli conflict in the Middle East (Vallone, Ross and Lepper, 1985). Each group saw the programs as biased against their side and in favor of the other. Conversely, students with 'generally mixed' or neutral feelings about the conflict perceived the broadcasts as neutral and fair. Studies conducted since have replicated these findings and refined HMP theory (Giner-Sorolla & Chaiken, 1994;Perloff, 1989). Later studies have argued that hostile perceptions are a function of people's involvement in an issue (Christen, Kannaovakun & Gunther, 2002;Gunther, 1992) or prior attitudes about that issue (Arpan & Raney, 2003), rather than simply the result of partisan identities or ideological commitments.
There may also be other cases wherein people on either side of an issue perceive mass media coverage as unequivocally biased against one side and in favor of the other, albeit to different degrees depending on the direction of that bias. To account for these cases,  theorized a 'relative' version of hostile media perceptions (RHMP) to explain cases in which people on both sides of an issue exposed to mass media coverage will agree on the direction but disagree on the magnitude of its bias. RHMP theory describes cases wherein each group perceives a mass-mediated message 'to be either more hostile to, or at least less agreeable with, their own point of view than the opposing group sees it' (2001, p. 690). As a result, partisans perceive less bias in mass media 'slanted to support their view than their opponents on the other side of the issue' (Feldman, 2011, p. 411; see also Arceneaux et al., 2012;Gunther, Miller and Liebhart, 2009). Research has shown robust support for RHMP (Arceneaux & M. Johnson, 2015, Arceneaux et al., 2012Coe et al., 2008;Feldman, 2011;Gunther & Christen, 2002;. In addition, Matheson and Dursun (2001) found that HMP can extend to people's perceptions of argument strength. They exposed Serb and Muslim immigrants from Bosnia to media reports covering contemporaneous conflict between these factions in the country from which they emigrated. These reports were also balanced, in that they contained pro and con arguments for each side of the issue. Thus, Matheson and Dursun (2001) found that each group perceived not only the reports and editors as biased against their side, but each group also rated the arguments presented for their side as weaker than the other side's.
In sum, an HMP approach expects that people with strong preexisting attitudes on an issue will perceive mass media about that issue as biased against their preexisting views and, in turn, less credible (Arpan & Raney, 2003;Johnson & Kaye, 1998). In addition, HMP predicts that these people will perceive media arguments that support their preexisting positions as weaker and arguments in these media that oppose their preexisting positions as stronger (Arpan & Raney, 2003;Matheson & Dursun, 2001).
Applying the HMP approach to our study of the CIR, recall first that the Citizens' Statement consists of three main parts. It begins with Key Findings on the measure, which are meant to consist of neutral information about it. That is followed by separate sections for the pro and con arguments on the measure, which balance 'biased' arguments from each side on the issue. The HMP approach predicts that voters' preexisting views on the ballot measure will cause them to diverge in their perceptions of the strength of the Statement's pro and con arguments. A voter in favor of the measure will perceive the pro arguments as weaker and its con arguments as stronger and vice versa for a voter opposing the measure. Voters will also perceive the Statement's Key Findings as more biased against their preexisting views and in favor of the opposite position on the measure.
H 1 : Relative to voters with no preexisting position on a ballot measure, voters supporting or opposing that measure will perceive (a) a Citizen Statement's pro or con arguments consistent with their preexisting views as weaker, (b) the pro or con arguments opposite from their views as stronger, and (c) Key Findings as more biased against their preexisting views and less credible.

Confidence in Knowledge of the CIR
Another factor that can affect the impact of hostile media perceptions is how a person perceives the message's source (Gunther & Liebhart, 2006). A message from a source considered part of a person's ingroup dampens the HMP effect as compared to a source representing an outgroup (Cohen, 2003;Duck, Terry and Hogg, 1998;Hartmann & Tanis, 2013;Reid, 2012). Other studies suggest that the HMP effect is reduced when the source of the message is perceived to be less biased in general (Choi et al., 2009;Giner-Sorolla & Chaiken, 1994;Gunther & Liebhart, 2006). Both explanations imply an element of trust when it comes to how a message source shapes bias and credibility perceptions (Tsfati & Cohen, 2005. When people trust its source, a message's content can appear less biased and more credible (Giffin, 1967;Gunther et al., 2009;Hovland & Weiss, 1951;T. J. Johnson & Kaye, 1998;Kiousis, 2001;Metzger & Flanagin, 2013;Pornpitakpan, 2004).
In addition, mass media created by governments are particularly susceptible to the HMP effect due to citizens' inherent distrust of governments (Ceron & Memoli, 2015;Chia et al., 2007;Moehler & Singh, 2011;Tsfati & J. Cohen, 2005). Skepticism toward official sources reduces perceptions of these media as unbiased and credible (T. J. Johnson & Kaye, 2004;T.-T. Lee, 2010). Put in the context of the CIR, this has implications for perceptions of the Citizens' Statement. Recall that the Statement is written by a small group of randomly selected citizen panelists but distributed by the Oregon Secretary of State in the official Voters' Pamphlet. As such, the Statement is a distinctive kind of deliberative media-one authorized by state government, produced by citizens through a deliberative forum, overseen by an independent organization (Healthy Democracy), and transmitted through a mass-mailed government document.
How might citizens perceive such a source and its message? Research on the British Columbia Citizens' Assembly suggests that voters who are more aware of the Statement's deliberative origins will consider it less biased and more credible (Cutler et al., 2008;Fournier et al., 2011). Nevertheless, if the Statement does not provide enough information about its origins, voters may erroneously construe it as coming directly from public officials-and, therefore, as more biased and less credible. In addition, voters' knowledge of other features of the CIR's design (e.g., how its panelists were selected, how its deliberative process was conducted, and who sponsored and organized the CIR) may also affect their perceptions of the Statement (Boulianne, 2018; Gastil et al., 2016;Niessen, 2019).
Thus, we predict that voters who think the Citizens' Statement provided enough information about the CIR's design should feel more confident in their assessment of this minipublic. Those with more confident assessments will perceive the CIR's pro and con arguments as stronger. They will also view its Key Findings as less biased and more credible.
H 2 : Relative to voters with less confidence in their knowledge of the CIR, voters with more confidence in that knowledge will perceive (a) both the Statement's pro and con arguments as stronger and (b) its Key Findings as less biased and more credible.

Faith in Deliberation
Research on minipublics has shown they can render considered judgments and inform citizens' opinions and voting intentions (Boulianne, 2018;Cutler et al., 2008;Fishkin & Luskin, 2005;Fournier et al., 2011;Gastil et al., 2016Gastil et al., , 2018Ingham & Levin, 2018a, 2018bLuskin, Fishkin and Jowell, 2002;Már & Gastil, 2020), as they may represent 'trusted information proxies' citizens can utilize in forming those opinions prior to voting (MacKenzie & Warren, 2012;Warren & Gastil, 2015). However, citizens will only utilize minipublics in this manner to the extent that their deliberative media are perceived to be unbiased and credible. Deliberative theory also suggests that perceiving these media as deliberative 'requires a certain faith' in the capacity for public deliberation to render sound judgment (Fung, 2005, p. 401; see also White, 2010). Fung (2005, p. 401) describes this 'faith in deliberation' as having two components: The first component…is that deliberation can produce good results not only under circumstances of perfect equality and deep mutual deliberative commitment but also under more realistic conditions. Its second component is that circumstances that are hostile to deliberation can sometimes be made more congenial. Fung (2005, p. 406) suggests having faith in deliberation requires believing not only that it will 'generate superior social choices compared with other methods of making decisions' but also that it can be realized in reality, and 'improved [ideally] by increasing the quality of information or the [deliberative] capacities of participants.' Put simply, faith in deliberation rests on a belief that it is both desirable and feasible as a way of coming to considered judgments. In the case of the Citizens' Statement, this means that voters will consider the CIR a 'trusted information proxy' to the extent that they consider deliberation a sound method for making judgments about ballot measures. This also speaks to what makes faith in deliberation distinct from confidence in one's knowledge of the CIR. Whereas confidence comes from the amount of information provided about the CIR, faith is a deeper conviction about the virtue of deliberation independent of one's knowledge of the CIR, per se.
No prior work has considered how faith in deliberation may condition perceptions of deliberative media. The closest research appears in , which showed connections among faith in the jury system, willingness to serve on a jury, and public affairs media use. Similarly, we expect that those with more faith in deliberation will perceive not only the pro/con arguments included in the Statement as stronger but also its Key Findings as less biased and more credible.
H 3 : Relative to those voters with less faith in deliberation, those voters with more faith in deliberation will (a) perceive both the Citizens' Statement's pro and con arguments as stronger and (b) perceive the Statement's Key Findings as less biased and more credible.

Participants and Procedures
Registered Oregon voters were recruited through Qualtrics, an online survey service that provides Internet survey panels. The original survey was conducted from October 16 to November 7, 2014, following protocols approved by the Pennsylvania State University Human Subjects Division (Gastil et al., 2016). Because Oregon Election Day was November 4, 2014, the survey period started 19 days before and closed three days after that date.
The original survey used a larger sample of 2,077 respondents to conduct a broader evaluation of the CIR (Gastil et al., , 2016. Only a subsample of these respondents (N = 313) had not previously been exposed to the 2014 Citizens' Statements and were in a survey condition that included measurement of all the variables relevant to our hypotheses. This sample was large enough to detect moderate effect sizes (Cohen, 1988) equivalent to or greater than those found in previous HMP research (Hansen & Kim, 2011). Table 1 provides demographic information about the sample and descriptive statistics for all the measures in this study.
Survey respondents were randomly assigned to read the Citizens' Statement for either Measure 90 (n = 144) or Measure 92 (n = 169). Table 2 shows the demographic information and descriptive statistics for the measures in this study broken down by the assigned ballot measure.

Measures
Voting preference Before being exposed to the Citizens' Statement on the ballot measure to which they were assigned, respondents were asked how they had voted or were planning to vote on that ballot measure. Those who took a stance for or against the ballot measure were asked if they had 'leaned toward yes,' 'leaned toward no,' or 'leaned neither way.' Based on their answers, they were placed in one of three categories: 'Yes' (n = 111), 'No' (n = 108), or Undecided (n = 94).

Confidence in Knowledge of the Citizens' Initiative Review
Voters' confidence in their knowledge of the CIR was operationalized as their satisfaction with the amount of information provided about it in the Statement. This measure used an index consisting of three 'yes' (1) or 'no' (0) items asking voters whether the preface of the Statement provided enough information about (a) how the citizen panelists were selected, (b) how the CIR panel-process was conducted, and (c) who sponsored and organized the CIR. Averaging these items created a reliable index of Confidence in Knowledge about the CIR that ranged from 0 to 1 (M = .52, SD = .40, α = .75). voters' faith in deliberation using five-point Likert scales ranging from 'strongly disagree' (-2) to 'strongly agree'

Faith in deliberation
(2). The three items read as follows: ' even people who strongly disagree can make sound decisions if they sit down and talk'; ' everyday people from different parties can have very civil conversations about politics'; and 'the first step in solving our common problems is to discuss them together.' Averaging these three items resulted in a reliable scale (M = .93, SD = .70, α = .73). A fourth reversecoded item was dropped due to its strong, negative drag on reliability.

Perceived strength of pro and con arguments
We measured perceived strength of pro and con arguments in line with prior HMP studies (Gunther & Liebhart, 2006;. As in Matheson and Dursun (2001), these items rated how well the Statement represented the pro and con sides of the issue. For both pro and con arguments, we used an index of three items on four-point scales that asked respondents to rate arguments from 'very weak' to 'very strong,' from 'not at all relevant' to 'completely relevant,' and from 'not at all trustworthy' to 'completely trustworthy.' With 'don't know' responses serving as a midpoint, scores were averaged to make reliable scales from -2 to +2 for Pro Argument Strength (M = .06, SD = .91, α = .76) and Con Argument Strength (M = .05, SD = .95, α = .79).

Perceived bias in Key Findings
To measure perceived bias in the Key Findings, we used two versions of one measure mirroring those used in previous HMP research . To measure the extent to which voters perceived Key Findings as biased in a particular direction (i.e., for or against the ballot measure), a single item asked respondents to rate the Key Findings' bias with a five-point scale ranging from 'strongly against' (-2) to 'strongly in favor' (2), with 'generally neutral' (0) as the midpoint (M = .09, SD = 1.07).
To measure the extent to which respondents perceived the Key Findings as biased in either direction, the previous item was transformed by calculating its absolute value (M = .76, SD = .76).

Perceived credibility of Key Findings
We measured the perceived credibility of the Key Findings by following a method used in previous HMP research (Gunther & Liebhart, 2006; and other studies of mass media perceptions (Metzger, 2007;Wathen & Burkell, 2002). We used an index consisting of two items using five-point scales that asked respondents how ' accurate' and 'relevant' they considered the Key Findings. Responses ranged from 'not at all' (-2) to ' completely' (2), with ' don't know' as a midpoint (M = .13, SD = .67, α = .82). Finally, we created variables to measure voters' partisan and ideological self-identification, political attitudes, and voting behavior. These appear in Table 3.

Results statistical approach
We tested our hypotheses using multiple-linear regression analyses including predictors corresponding to each hypothesis. This approach necessitated evaluating each sub-hypothesis simultaneously, rather than proceeding through each hypothesis separately. Each regression model assesses the predictive power of voters' preexisting preferences on the ballot measure (H 1 ), their confidence in their knowledge of the CIR (H 2 ), and their faith in deliberation (H 3 ). What distinguishes each model is its criterion. The models measure voters' perceptions of the three parts of the Citizens' Statement: pro arguments, con arguments, and Key Findings. We needed to create regression models with different criteria to test our hypotheses when it came to perceptions of bias in the Key Findings. To test H 1 , we created a model with perceived bias in the Key Findings as its criterion. That permitted testing whether voters' preexisting preferences predicted perceptions of that section as biased in a particular direction for or against them. To test H 2 and H 3 , we created a model with the absolute value of perceived bias in the Key Findings as its criterion. Thus, we could test H 2 and H 3 and see whether voters' confidence in their knowledge of the CIR and faith in deliberation predicted perceptions of that section as unbiased in general. We then included both these criteria (i.e., perceived bias in the Key Findings and the absolute value thereof) in our final model predicting perceived credibility of the Key Findings. After all, an HMP approach predicts that mass media considered more biased (either in general or against preexisting preferences) will be viewed as less credible (Arpan & Raney, 2003).
Throughout our results, we report regression coefficients in their standardized forms (β). The statistical tables show their unstandardized coefficients, standard errors, and adjusted coefficients of determination (R 2 adjusted ).

Perceived Strength of Pro and Con Arguments
The first regression model tested predictors of Pro Argument Strength, R 2 = .20, F(13, 298) = 5.71, p < .001. Table 4 shows that it was significantly predicted by voters' preexisting preferences, such that those who supported the ballot measure gave more favorable ratings to the pro arguments relative to those who did not (β = .16, p = .005). Those who opposed it gave less favorable ratings to them relative to those who did not (β = -.19, p = .001), though these findings were both in the direction opposite to H 1 . Those voters with higher confidence in their knowledge of the CIR (β = .13, p = .013) and faith in deliberation (β = .15, p = .006) gave the pro arguments more favorable ratings, supporting both H 2 and H 3 . The second regression model tested predictors of Con Argument Strength, R 2 = .12, F(13, 298) = 3.21, p < .001. Table 4 shows that, unlike its aforementioned counterpart, Con Argument Strength was not significantly predicted by voters' preexisting preferences, meaning H 1 was not supported. As with Pro Argument Strength, voters with higher confidence in their knowledge of the CIR (β = .17, p = .002) and faith in deliberation (β = .15, p = .008) gave the con arguments more favorable ratings, supporting both H 2 and H 3 .

Perceptions of Key Findings
The third and fourth regression models predicted perceived bias in the Key Findings (R 2 = .07, F(13, 298) = 1.75, p = .050) and its absolute value (R 2 = .10, F(13, 298) = 2.39, p = .005). Table 5 shows that neither of these criteria was significantly predicted by voters' preexisting preferences, confidence in their knowledge of the CIR, or faith in deliberation. Thus, these findings did not support any of our hypotheses. The last regression model predicted perceived credibility of the Key Findings, R 2 = .14, F(15, 296) = 3.26, p < .001. Table 5 shows that, though this criterion was not significantly predicted by voters' preexisting preferences, Although none of our models supported H 1 , the findings generally supported both H 2 and H 3 . In other words, voters' preexisting preferences on a ballot measure did not predict how they perceived the Citizens' Statementat least not in the anticipated direction. By contrast, voters' confidence in their knowledge of the CIR and faith in deliberation positively predicted how they perceived each of the Statement's parts, except for perceptions of the Key Findings as unbiased.

Discussion
Our study of the 2014 Oregon CIR found no evidence of hostile media perceptions occurring as a result of reading Citizens' Statements. In fact, the most relevant significant effects we found were the opposite of an HMP prediction. The Statement's pro arguments were perceived as stronger by voters supporting the ballot measure and weaker by those opposing it. These findings suggest that voters perceived the arguments relative to their preexisting views in terms of how much they agreed with those views rather than how well those views were represented in the Statement. As such, these results are more consistent with the research on confirmation bias (Taber & Lodge, 2006) or 'biased assimilation' (see Hergovich, Schott & Burger, 2010), wherein people perceive information ' confirming their preexisting attitude as more convincing than' information ' disconfirming their preexisting attitude' and vice versa (Munro & Ditto, 1997, p. 636). Based on these findings, we suggest that future research study of minipublics from a confirmation bias perspective (Már & Gastil, 2020) rather than one based on HMP.
We did find ample evidence in support of hypotheses derived from deliberative theory. Voters with more confidence in their knowledge of the CIR and more faith in the efficacy of public deliberation generally gave higher quality ratings to both pro and con arguments in the Citizens' Statements, and they rated its Key Findings as more credible. These findings complement those of previous minipublic studies (Boulianne, 2018;Cutler et al., 2008;Fournier et al., 2011;Már & Gastil, 2020;Niessen, 2019) by showing how deliberative media's utility hinges on a minipublic's transparency and openness and its internal deliberative quality (Carson, 2011;Karpowitz & Raphael, 2014;O'Flynn & Sood, 2014). Therefore, future minipublic practitioners should consider how such events can be designed transparently (particularly with respect to their deliberative media). Future research should explore where and how citizens' faith in public deliberation may be bolstered in a deliberative system (Manosevitch, 2019) so as to boost minipublics' deliberative quality.
That said, this study had considerable limitations. First, it was a secondary analysis of cross-sectional data collected for another purpose (see Gastil et al., 2015). Thus, we could not make causal inferences about relationships we found between variables. In particular, we did not measure perceptions of the Statement's reach (i.e., how many people read it). Future research on minipublics should examine how their perceived reach affects public perceptions of their outputs. Second, the survey design did not allow us to measure how carefully voters actually read the Citizens' Statement. A more careful study would discern which of its parts held their attention and for how long. Finally, the survey only allowed us to examine perceptions of CIR messages about ballot measures on electoral processes and food labeling. Since HMP may be issue-dependent (D'Alessio, 2003), future research may find that results do not generalize across a wider range of policy questions.
Overall, our study showed the CIR's Citizens' Statements to be of high deliberative quality. This supports the idea that minipublics like it represent 'trusted information proxies' that citizens can utilize in forming opinions before making decisions (MacKenzie & Warren, 2012;Warren & Gastil, 2015). People may not perceive the deliberative media generated by a minipublic with the same hostility as they do for other mass media. Nevertheless, we did find confirmation bias in the ratings of some arguments, and this could limit the efficacy of minipublic reports. Therefore, we recommend continued study of how minipublics can most effectively generate messages that enhance the larger deliberative system.