Harold D. Clarke is the Ashbel Smith Professor of Political Science, University of Texas at Dallas, and Adjunct Professor of Government at the University of Essex. He is the author of numerous books and articles, including A Polity on the Edge: Canada and the Politics of Fragmentation with Alan Kornberg and Peter Wearing (University of Toronto Press, 2000) and Political Choice in Britain with David Sanders, Marianne C. Stewart, and Paul Whiteley (Oxford University Press, 2004).