Daniel Schlozman is associate professor of political science at Johns Hopkins University. He is the author of When Movements Anchor Parties: Electoral Alignments in American History; and coauthor of The Hollow Parties: The Many Pasts and Disordered Present of American Party Politics.
Sam Rosenfeld is associate professor of political science at Colgate University. He is the author of The Polarizers: Postwar Architects of Our Partisan Era; and coauthor of The Hollow Parties: The Many Pasts and Disordered Present of American Party Politics.