Keith E. Whittington is the William Nelson Cromwell Professor of Politics at Princeton University. He is the author of Political Foundations of Judicial Supremacy; Constitutional Interpretation; and Constitutional Construction. He pursues research in the fields of constitutional theory, American political and constitutional development, and American political institutions. R. Daniel Kelemen is Associate Professor of Political Science at Rutgers University. He is the author of The Rules of Federalism. He pursues research in the fields of the politics of the European Union, comparative political economy, and federalism and environmental policy. Gregory A. Caldeira is Distinguished University Professor of Political Science and Law at Ohio State University. He pursues research and teaching in the fields of judicial processes in the United States and Europe, organized interests, and American political institutions. His publications on these subjects have appeared in such journals as the American Political Science Review, American Journal of Political Science, Journal of Politics, and the British Journal of Political Science. He is former chair of the Law and Courts Section of the American Political Science Association, former editor of the American Journal of Political Science, and former president of the Midwest Political Science Association.