David W. Brady is Bowen H. and Janice Arthur McCoy Professor of Political Science and Leadership Values at Stanford University. His books includeRevolving Gridlock (1998), Critical Elections in the U.S. House of Representatives (Stanford, 1988), andParty, Process, and Political Change in Congress (Stanford, 2002). Mathew D. McCubbins is Professor of Political Science at the University of California, San Diego. His books includeThe Logic of Delegation, Legislative Leviathan, and Party, Process, and Political Change in Congress (Stanford, 2002).