Geraghty has some interesting poll analysis:

So while Survey USA is the only one putting North Carolina in single digits, their track record lately suggests we shouldn't expect them to be too far off the final results. Also note that Survey USA puts Hillary ahead in Indiana by 9 percent.

Geraghty tracks the firm's performance over the last few contests and thinks the most recent surveys may be indicating a shift away from Obama. More on that over at Slate as well.