Provides a new way of thinking about parties formed by social movements, and their evolution over time.

Santiago Anria is Assistant Professor of Political Science and Latin American Studies at Dickinson College, Pennsylvania. His research focuses on social movements, political parties, and democracy in Latin America, and has appeared in journals including Comparative Politics, Comparative Political Studies, the Journal of Democracy, and Latin American Politics and Society. He received his Ph.D. in Political Science from the University of North Carolina, Chapel Hill.

Introduction; 1. Theoretical framework and methods; 2. Origins and ascendance to power; 3. Candidate selection patterns; 4. National policymaking patterns; 5. The MAS in comparative perspective; Conclusions.