Democracy Now! has this to report:

McCain Supporters Harass Obama Voters in North Carolina

In North Carolina, over 200,000 residents have already cast ballots in early voting. In Fayetteville, a group of John McCain supporters heckled and harassed a group of mostly black supporters of Barack Obama as they voted on Sunday. The Washington Times reported the McCain backers shouted and mocked the voters as they walked into the voting place. The website Facing South reports the McCain supporters likely broke the Voting Rights Act of 1964, which prohibits anyone from intimidating or threatening a person for voting or attempting to vote. On that same day in Fayetteville, North Carolina, thirty people reported having their tires slashed after attending an Obama rally.

And The Huffington Post has these videos of the hecklers protesting democracy: