John H. Aldrich is Pfizer-Pratt University Professor of Political Science, Duke University. He is the author or co-author of Why Parties, Before the Convention, Linear Probability, Logit and Probit Models, and a series of books on elections, the most recent of which is Change and Continuity in the 2012 Elections. He is past President of the Southern Political Science Association and of the Midwest Political Science Association and is currently serving as president of the American Political Science Association. He is a Fellow of the American Academy of Arts and Sciences and held a Guggenheim Fellowship.