Millennials cheer for Democratic presidential candidate Barack Obama at a rally in Roanoke, Va., in 2008. Young voters are poised to play a key role in choosing the next president. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

A woman casts her ballot during early voting in Toledo, Ohio. Members of the silent generation are more likely to vote for Republicans than for Democrats, according to a recent study by the Pew Research Center. J.D. Pooley/Getty Images hide caption

itoggle caption J.D. Pooley/Getty Images