This actually isn't comforting.
Why not? Obama doesn't need North Carolina to win, and the fact that it's this close is a good sign.
It seems a couple points off, that's why. It's worrying that the others may be off as well.
It's a state that's moving left with an influx of Northerners and Hispanics, and at the same time moving right because whites in NC are going to swing a few points to Romney. It's going to be close and PPP has nailed every statewide election they've done here... in 2008, a Democratic year, and 2010, a very weird Tea Party/GOP year.