Hey Buddy,
I'm not saying that Obama is going to win, either the nomination or the election. I do think there are people who would never vote for Obama. The difference is that I think the people who fall into that category would never vote for Hillary, either. There may be some who are voting for Hillary for other than political reasons. As I've said, I'd understand women voting for Hillary based solely on her sex.
But, here's the thing. I don't think there are many people in this country who are voting for Hillary because she's white. There may be some, though, who will vote against Obama because he's not. Honestly, whether people mean it or not, that's the way the phrase "McCain by default" sounds to many people. I.e., he's the only white candidate left.
However, call me an idealist, but I think there are lots of reasons to disbelieve that expectation. I think that white Americans are, today, bigger than that, in general, and especially at that high a political level. If a black man can be the mayor of an almost all white town in the South, then maybe we should stop thinking like it's the bus boycott era. Perhaps the most significant thing that the Obama campaign (not the man) have accomplished is the registration of a record number of new (D) voters. These are young people who grew up watching the Planeteers and Power Rangers. Many of them weren't even born in 1980. Some weren't born in 1990. Moreover, even their parents would vote for Colin Powell --but not Alan Keyes.
These are just the preliminaries; the main event is a long way off. We'll have to wait and see.