Partisan Hostility and American Democracy

James N. Druckman is professor of political science at the University of Rochester. Samara Klar is professor of political science at the University of Arizona. Yanna Krupnikov is professor of communication and media at the University of Michigan. Matthew Levendusky is professor of political science at the University of Pennsylvania. John Barry Ryan is associate professor in the Department of Communication and Media and the Department of Political Science at the University of Michigan.