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Partisan Americans like members of their own party more than members of the opposing party. Scholars often interpret this as evidence that party identity or loyalty influence interpersonal affect. First, we reassess previous studies and demonstrate that prior results are also consistent with what we would predict if people cared only about policy agreement. Next, we demonstrate the difficulty of manipulating perceptions of party identity without also manipulating beliefs about policy agreement and vice versa. Finally, we show that partisans care much more about policy agreement than they do about party loyalty when the two come into conflict. Our analyses suggest that partisan Americans care about policy agreement; we have little convincing evidence that they care about partisan identity or loyalty per se, and scholars will have to find new research designs if they want to convincingly estimate the effects of identity or loyalty independent of policy substance. [ABSTRACT FROM AUTHOR]

Do people form relationships based upon political similarity? Past work has shown that social relationships are more politically similar than expected by chance, but the reason for this concordance is unclear. Is it because people prefer politically similar others, or is it attributable to confounding factors such as convergence, social structures, and sorting on nonpolitical characteristics? Addressing this question is challenging because we typically do not observe partners prior to relationship formation. Consequently, we leverage the domain of online dating. We first conducted a nationwide experiment in which we randomized political characteristics in dating profiles. Second, we analyzed behavioral data from a national online dating community. We find that people evaluate potential dating partners more favorably and are more likely to reach out to them when they have similar political characteristics. The magnitude of the effect is comparable to that of educational homophily and half as large as racial homophily. [ABSTRACT FROM AUTHOR]

Previous research finds that House majority members and members in the president's party garner additional federal spending in their districts. Using federal spending data in individual districts, we implement two research designs to distinguish elected officials enacting policies that benefit like-minded voters-the party in the electorate-from those that benefit same-party elected officials- the party in government. We find robust evidence that presidential partisanship is associated with large differences in spending correlated with voter preferences, but little evidence that presidents favor areas represented by their party in the House. By contrast, control of the House is associated with differences in spending by voter preferences and with modest increases in spending in districts held by members of the majority. These findings have important implications for understanding presidential influence, as well as the role of parties in the House and in coordinating between elected branches. [ABSTRACT FROM AUTHOR]

Partisanship is strongly correlated with attitudes and behavior, but it is unclear from this pattern whether partisan identity has a causal effect on political behavior and attitudes. We report the results of a field experiment that investigates the causal effect of party identification. Prior to the February 2008 Connecticut presidential primary, researchers sent a mailing to a random sample of unaffiliated registered voters who, in a pretreatment survey, leaned toward a political party. The mailing informed the subjects that only voters registered with a party were able to participate in the upcoming presidential primary. Subjects were surveyed again in June 2008. Comparing posttreatment survey responses to subjects’ baseline survey responses, we find that those reminded of the need to register with a party were more likely to identify with a party and showed stronger partisanship. Further, we find that the treatment group also demonstrated greater concordance than the control group between their pretreatment latent partisanship and their posttreatment reported voting behavior and intentions and evaluations of partisan figures. Thus, our treatment, which appears to have caused a strengthening of partisan identity, also appears to have caused a shift in subjects’ candidate preferences and evaluations of salient political figures. This finding is consistent with the claim that partisanship is an active force changing how citizens behave in and perceive the political world. [ABSTRACT FROM PUBLISHER]