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The Moral Roots of Partisan Division: How Moral Conviction Heightens Affective Polarization

  • Kristin N. Garrett and Alexa Bankert
Abstract

Partisan bias and hostility have increased substantially over the last few decades in the American electorate, and previous work shows that partisan strength and sorting help drive this trend. Drawing on insights from moral psychology, however, we posit that partisan moral convictions heighten affective polarization beyond the effects of partisanship, increasing partisan animosity and copartisan favoritism. Testing this theory using data from two national samples and novel measures of affective polarization in everyday life, we find that people who tend to moralize politics display more partisan bias, distance and hostility, irrespective of partisan strength. These results shed light on a different moral divide that separates the American public and raise key normative questions about moral conviction and electoral politics.

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Department of Politics and International Relations, Wheaton College (E-mail: kristin.n.garrett@wheaton.edu); Department of Political Science, University of Georgia (E-mail: alexa.bankert@uga.edu). We would like to thank Tom Carsey, Tim Ryan, Mike MacKuen, Jim Stimson, Andrea Benjamin, Scott Clifford, participants in the State Politics Working Group at UNC-Chapel Hill, the editors at BJPS and the anonymous reviewers for providing insightful comments on previous versions of this article. We are also grateful for the Thomas M. Uhlman Summer Research Fellowship that generously funded this project. Data replication sets are available in Harvard Dataverse at: https://dx.doi.org/doi:10.7910/DVN/N5EGWL and online appendices at https://doi.org/doi: 10.1017/S000712341700059X

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