See this week's Talk/Talk "Crossing Over" with Fred Newman and Jacqueline Salit:
Salit: Chris Matthews, I believe, showed a clip of Obama making a statement after the Thursday night debate. Obama said 'If I'm the nominee, Hillary's supporters will vote for me, but if Hillary's the nominee, I don't know that she'll get all of mine.'
Newman: That's accurate.
Salit: Yes. This has to do with the war with independents and with the nature of the Obama coalition.