1. Departments of Political Science, Statistics, Mathematics, and Asian American Studies, University of Illinois at Urbana-Champaign, Champaign, IL, USA.
2. University of Illinois College of Law, Champaign, IL, USA.
3. National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Champaign, IL, USA.
4. Hoover Institution, Stanford University, Stanford, CA, USA.
5. Center for Advanced Study in the Behavioral Sciences, Stanford University, Stanford, CA, USA.
6. Department of Political Science, Stanford University, Stanford, CA, USA.
7. The Bill Lane Center for the American West, Stanford University, Stanford, CA, USA.