1 Departments of Political Science, Statistics, Mathematics, and Asian American Studies, University of Illinois at Urbana-Champaign, Champaign, IL, USA. wendycho@illinois.edu.
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.