New Measures of Partisanship, Ideology, and Policy Mood in the American States

We construct measures of U.S. state partisan identification, self-reported ideology, and policy mood using data from the 2000 and 2004 National Annenberg Election Surveys (NAES) and the 2006 Cooperative Congressional Election Study (CCES). These measures improve on existing methods for estimating state-level preferences because the surveys provide larger state samples without pooling across years. After detailing our methods for constructing the measures, we assess their validity through comparisons with measures already in use by scholars of state politics. We find that our measures correlate strongly with those created by Erikson, Wright, and McIver (1993) and Berry et al. (1998) and with measures from state-level polls. We conclude that our measures can be useful to research in state politics.