Percent Voted in 2012 (census.gov)
"Voting rates are historically higher in years with presidential elections than in congressional election years."
Young and Black in South Carolina: How Will They Vote? (wsj.com)
"A striking pattern is emerging in the Democratic presidential primary, with Bernie Sanders energizing young voters and Hillary Clinton relying on African-American backers to create an insurmountable edge for her candidacy."
How Voter ID Laws Are Being Used to Disenfranchise Minorities and the Poor (theatlantic.com)
"First, let's call it what it is."