Research Interests: American political institutions, formal theory, research methods
Polarized America: The Dance of Ideology and Unequal Riches (with Keith Poole and Howard Rosenthal), MIT Press, 2006.
"Does Gerrymandering Cause Polarization?" (with Keith Poole and Howard Rosenthal), American Journal of Political Science, 2009.
"Presidential Vetoes in the Early Republic: Changing Constitutional Norms or Electoral Reform," Journal of Politics, 2009.