Income Inequality, Political Participation, and Political Polarization

• Proportion who Vote in Presidential Elections by Income Quintile, 1975-2005
  The proportion of adults voting in presidential elections is higher for adults in high income families, with greater disparities in more recent presidential elections.
• Proportion Registered to Vote in Presidential Elections by Income Quintile, 1975-2005
  The proportion of adults registered to vote in presidential elections is higher for adults in high income families, and these disparities have increased slightly over time.
• Proportion who Vote in Presidential Elections by Educational Attainment, 1975-2005
  More educated adults are considerably more likely to vote in presidential elections, with the difference between the most and least educated increasing over time.
• Proportion Registered to Vote in Presidential Elections by Educational Attainment, 1975-2005
  More educated adults are more likely to be registered to vote in presidential elections, with the difference between the most and least educated adults increasing over the past three decades.
• Gini Index of Income Inequality and Polarization, 1947-2001
  The degree of political polarization in the U.S. House of Representatives has increased in lock step with the degree of income inequality in the nation as a whole.
• Proportion Identifying as Republican by Income Quintile
  High income voters are more likely to identify with the Republican part. The relationship between income and partisan identification has increased since 1960.