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Research article
First published online December 31, 2013

Voter Polarization, Strength of Partisanship, and Support for Extremist Parties

Abstract

In this study, we evaluate how voter polarization and the level of partisanship influence electoral outcomes. We show that when the level of partisanship is low, the polarization of voter preferences translates into popular support for extreme parties. In contrast, longstanding attachments to mainstream (moderate) parties dampen the relationship between voter polarization and support for extreme parties. The implication of these findings is that the lack of voter attachment to parties contributes to extreme party competition, while strong attachment can help reduce party extremism even if electorates are polarized.

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Biographies

Lawrence Ezrow is a professor in the Department of Government at the University of Essex. His research interests are in comparative political representation and party strategies in elections. He has published Linking Citizens and Parties (2010, Oxford University Press), and his articles have been published in the American Journal of Political Science, British Journal of Political Science, Comparative Political Studies, Journal of Politics, World Politics, and other journals.
Margit Tavits is an associate professor of political science at Washington University in St. Louis. Her research interests include party politics, political institutions, postcommunist democracies, and corruption. She is the author of Presidents With Prime Ministers (2008, Oxford University Press) and Postcommunist Democracies and Party Organization (2013, Cambridge University Press). Her work has also appeared in the American Journal of Political Science, American Political Science Review, British Journal of Political Science, Comparative Political Studies, Journal of Politics, and other journals.
Jonathan Homola is a PhD student in Political Science at Washington University in St. Louis. He received an MA degree at the University of Essex and completed his undergraduate studies at Freie Universität Berlin, where he also worked for the Manifesto Project at the Social Science Research Centre (WZB). His previous research is forthcoming in the Journal of Politics.