This can't be a positive leading indicator for Obama, I would think. The timing is perfect to get more Democrats in the state to give her another look. And given that Hillary is taking her case to the superdelegates based on the popular vote - plus the Democrats' insane winner-takes-barely-more-than-the-loser system, she's got every incentive to contest North Carolina even if she is all but certain to lose the state.
The Clintons are not going quietly.