Harold D. Clarke, Ph.D. Duke University, is Ashbel Smith Professor, School of Soical Sciences, University of Texas at Dallas, and Adjunct Professor, Department of Government, University of Essex. His research on electoral choice and the political economy of party support in Great Britain, the United States and Canada has been supported by the National Science Foundation (U.S.), the Economics and Social Research Council (U.K.), and the Social Sciences and Humanities Research Council (Canada). He is the author of numerous articles published in journals such as the American Journal of Political Science, the American Political Science Review, the British Journal of Political Science, the Journal of Politics and Political Analysis. His most recent book is Political Choice in Britain (Oxford University Press, 2004). Forthcoming books include Performance Politics: Britain (Cambridge University Press) and Political Choices: Canada and the United States (Broadview Press). His teaching interests focus on research methods, and he regularly teaches advanced time series analysis at the Essex Summer School in Data Collection and Analysis. Clarke is currently a principal investigator for the 2005 British Election Study and principal investigator for the Dynamics of Party Support in Britain project. He is also conducting the Political Support in America and Political Support in Canada voting studies. He is editor of Electoral Studies.