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Conducted one of the first large-scale randomized field experiments in political science. Contributed to the literatures on political participation, hate crime, political partisanship, campaign finance, preelection polling, and experimental design. Books include Field Experiments: Design, Analysis, and Interpretation (with Alan S. Gerber), Get Out the Vote: How to Increase Voter Turnout (with Alan S. Gerber), Partisan Hearts and Minds: Political Parties and the Social Identities of Voters (with Bradley Palmquist and Eric Schickler), and Pathologies of Rational Choice Theory: A Critique of Applications in Political Science (with Ian Shapiro).  Helped found the Experimental Research Section of the American Political Science Association and served as its first president.