Here's the white vote trend:
Clearly, Obama has secured a great deal of former Edwards supporters, but that doesn't fully account for his rise. It appears that undecided white voters have been breaking heavily for Obama in the last few polls in addition to a significant Edwards decline and a slight Clinton decline.
Those are the best numbers that I've seen for Obana since this became a Race race.
Obama will need to break 30% of the white vote to get the nomination.
He will, except in maybe the south.