This study reviewed a body of empirical research on Carole Pateman's democratic spillover thesis, which argues that democratic participation in the workplace spill over into political participation. The review revealed significant variance in defining and measuring of workplace democracy and participation among quantitative empirical studies on the spillover thesis. The review also discovered that majority of the reviewed studies omitted higher level participation as a predictor, and political efficacy, which is a mediating mechanism between workplace participation and political behaviors, in testing the hypotheses. Suggestions for future research and limitations are discussed.