Here the authors present the variation that exists in income inequality across the states, and variation in public awareness or concern about income inequality as measured by public opinion polls. Though politicians may decide to tackle income inequality even in the absence of public concern about inequality, the authors argue that government responses are more likely when and where there is a growing awareness of, and concern about, inequality, which is confirmed in the analyses in this book. To examine this question in subsequent chapters, a novel measure of public awareness of rising state inequality is developed. Using these estimates, this chapter shows that the growth in the public concern about inequality responds in part to objective increases in inequality, but also that state political conditions, particularly mass partisanship, shape perceptions of inequality.