but he did slip in the NC polls in May when he announced his support for gay marriage
http://www.realclearpolitics.com/epolls/2012/president/nc/north_carolina_romney_vs_obama-1784.html
For much of this cycle since May, it was regarded as a tossup and then sometimes, lean Ronney.
After early voting, I thought they had a shot
http://www.dailykos.com/story/2012/11/05/1156476/-NC-Pre-EDAY-Analysis-All-the-Data-About-NC-Screams-Tossup-Except-Conventional-Wisdom-GOTV
I was actually a little surprised he didn't finish closer and wonder if there were any shenanigans with the voting (though that's a long, long way from an accusation).