This is what makes Clinton's campaign so absurd and her supporters so pathetic.
Even if you grant that Obama will have trouble gaining the votes of racist whites, they clearly are not supporting Clinton, either. If they were, they'd be volunteering and contributing. But the aren't.
As a result, the only rational conclusion is the same I and others have been stating since the start of this bullshit: white voters who claim they won't support Barack wouldn't vote for Clinton either, if given the choice of McCain.
All this process has done is flush out the true GOPig blue collar whites from the Democratic Party. These are people who are against a black candidate but don't have the werewithal, inclination or ability to support a rival campaign.
In other words, who needs them?
Answer: nobody. McCain can take half to two thirds of Clinton's supporters in the fall, and it will be a drop in the bucket compared to the independents and re-engergized progressive/minority wing of the Democratic Party.