Objectives. Income inequality in the United States has risen during the past several decades. Has this produced an increase in partisan voting differences between rich and poor?

Methods. We examine trends from the 1940s through the 2000s in the country as a whole and in the states.

Results. We find no clear relation between income inequality and class-based voting.

Conclusions. Factors such as religion and education result in a less clear pattern of class-based voting than we might expect based on income inequality alone.