RICHARD G. NIEMI is Professor of Political Science at the University of Rochester. He is coauthor of Generations and Politics, The Political Character of Adolescence, Vital Statistics on American Politics and has published articles and chapters on voting behavior and other topics in political science.JOHN MUELLER is Professor of Political Science at the University of Rochester. His publications include War, Presidents and Public Opinion, Astaire Dancing, Retreat from Doomsday: The Obsolescence of Major War, and numerous articles and commentaries on politics, foreign policy, and related topics.TOM W. SMITH is Research Associate and Director of the General Social Survey at the National Opinion Research Center, University of Chicago. He has published numerous articles, chapters, and reports dealing with social change, public opinion, and trend analysis.