Public Policy Models in Deep Time Richard Barke Kristie Champlin Gurley School of Public Policy Harvard Law School Georgia Institute of Technology kgurley@jd15.law.harvard.edu barke@gatech.edu May, 2014 Under review at Policy Studies Journal An earlier version of this research was presented at the Annual Meeting of the Midwest Political Science Association, Chicago, Illinois, April 11-14, 2013. We are grateful for the suggestions of Hank Jenkins-Smith, Frank Laird, and Paul Quirk. Comments should be sent to barke@gatech.edu.