Presidential and vice presidential candidate names are seen on a ballot at the Polk County Election Office, Wednesday, Sept. 26, 2012, in Des Moines, Iowa. Voting in Iowa, one of 32 states that allow early voting, begins Thursday morning. (AP Photo/Charlie Neibergall)

Associated Press
Presidential and vice presidential candidate names are seen on a ballot at the Polk County Election Office, Wednesday, Sept. 26, 2012, in Des Moines, Iowa. Voting in Iowa, one of 32 states that allow early voting, begins Thursday morning. (AP Photo/Charlie Neibergall)
Presidential and vice presidential candidate names are seen on a ballot at the Polk County Election Office, Wednesday, Sept. 26, 2012, in Des Moines, Iowa. Voting in Iowa, one of 32 states that allow early voting, begins Thursday morning. (AP Photo/Charlie Neibergall)
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