We get our data from a variety of sources, without which we couldn’t produce our measures. Most of our archival data is from state legislative journals provided by the respective states.

We would like to acknowledge the generosity of the following organizations in providing convenient access to their data:


We have been funded by the National Science Foundation (SES-1059716 and SES-1060092), the Laura and John Arnold Foundation, the Russell Sage Foundation, Princeton University’s Woodrow Wilson School, the University of Houston, and the Robert Wood Johnson Foundation.