Daniel Schlozman is the Joseph and Bertha Bernstein Associate Professor of Political Science at Johns Hopkins University. He is the author of the book When Movements Anchor Parties. Sam Rosenfeld is an associate professor of political science at Colgate University and the author of The...

James N. Druckman is the Payson S. Wild Professor of Political Science and Faculty Fellow at the Institute for Policy Research at Northwestern University. He is also an Honorary Professor of Political Science at Aarhus University in Denmark. Druckman has published more than 180 articles and book...