Thousands of undecided voters only have a day to make up their minds, and both Barack Obama's and Hillary Clinton's campaigns know those could be the crucial votes that carry them to victory in North Carolina.

Sunday, Obama supporters canvassed streets all over Mecklenburg County, reminding people to cast their ballots on Tuesday.

Clinton's camp hosted several small events geared specifically toward undecided voters.

Political analyst Michael Bitzer said if other primaries are any indication, the last-minute decision makers could swing the vote one way or another.

"If you look at Ohio primaries, the exit polls said some 21 percent of people say they made their final decision in the last three days (before the primary), and Pennsylvania was 18 percent, which is a huge chunk," said Bitzer.

Current polls show Obama leads Clinton in the North Carolina Democratic primary race by about 8 percent.