PPP is out with new numbers in North Carolina (May 3-4) showing Obama up ten points:

Obama 53 (+2 vs. last poll April 26-27)
Clinton 43 (+4)

Pollster Tom Jensen writes that Clinton simply can't overcome the demographics of the state:

At the end of the day North Carolina's demographics make it nearly impossible for Hillary Clinton to do much better than a ten point loss here. We estimate that 35% of the primary electorate will be black, and with Obama winning those voters at a rate of 84-11, Clinton's 60-34 advantage with white voters is only enough to pull his lead down to ten.

Overall, Obama leads in the RCP Average for North Carolina by 7.0%.