Steven Levitsky is Professor of Government at Harvard University. His research interests include political parties, political regimes, and informal institutions, with a focus on Latin America. Professor Levitsky is author of Transforming Labor-Based Parties in Latin America: Argentine Peronism in Comparative Perspective (2003) and co-editor of Argentine Democracy: The Politics of Institutional Weakness (2005) and Informal Institutions and Democracy: Lessons from Latin America (2006), and he is currently co-editing a volume on the rise of the Left in Latin America in the 2000s. He has published...