Drawing on experiments and survey data, this title shows that Americans who watch partisan programming do become more certain of their beliefs and less willing to weigh the merits of opposing views or to compromise.

Matthew Levendusky is professor of political science at the University of Pennsylvania, where he also holds the Stephen and Mary Baran Chair in the Institutions of Democracy at the Annenberg Public Policy Center. His books include The Partisan Sort and How Partisan Media Polarize America. He is also the coauthor of We Need to Talk (with Dominik Stecula) and Democracy Amid Crises (Annenberg IOD Collaborative).