This paper reports on the results of validation of the self-reported registration status and voting behavior of respondents in the 1976 and 1978 American National Election Studies. The results indicate about one in seven of the respondents misreported their registration status or voting behavior. Comparative analyses are conducted using simple regression models to see if differences in their explanatory power arise using validated and self-reported dependent variables. The results show that there are no major changes in the fundamental nature of basic relationships that have been observed since the first surveys were conducted. Analysis of the effects of overreported participation on estimates of the partisan division of the vote in three sets of subnational contests reveals a likely “bandwagan” effect.