The Effect of Voter Identification Laws on Turnout
R. Michael Alvarez
California Institute of Technology
Washington University in Saint Louis - Center for Empirical Research in the Law
Jonathan N. Katz
California Institute of Technology - Division of the Humanities and Social Sciences
January 1, 2008
California Institute of Technology Social Science Working Paper No. 1267R
Since the passage of the Help America Vote Act in 2002, nearly half of the states have adopted a variety of new identification requirements for voter registration and participation by the 2006 general election. There has been little analysis of whether these requirements reduce voter participation, especially among certain classes of voters. In this paper we document the effect of voter identification requirements on registered voters as they were imposed in states in the 2000 and 2004 presidential elections, and in the 2002 and 2006 midterm elections. Looking first at trends in the aggregate data, we find no evidence that voter identification requirements reduce participation. Using individual-level data from the Current Population Survey across these elections, however, we find that the strictest forms of voter identification requirements - combination requirements of presenting an identification card and positively matching one's signature with a signature either on file or on the identification card, as well as requirements to show picture identification - have a negative impact on the participation of registered voters relative to the weakest requirement, stating one's name. We also find evidence that the stricter voter identification requirements depress turnout to a greater extent for less educated and lower income populations, for both minorities and non-minorities.
Number of Pages in PDF File: 28
Keywords: voter identification, turnout, Bayesian shrinkage, hierarchical model
Date posted: January 17, 2008
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