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Age, income, and educational attainment are significant factors affecting voter turnout. Educational attainment is perhaps the best predictor of voter turnout, and in the 2008 election, those holding advanced degrees were three times more likely to vote than those with less than high school education. Income correlated well with the likelihood of voting as well. The income correlation may be because of a correlation between income and educational attainment, rather than a direct effect of income.