This might alienate a very few black men, but from a pragmatic point of view, the sort of guys alienated by this probably don't make up a strong voting block in the first place (and they'd certainly never vote for John McCain). But the speech should strike a chord with middle- and upper-class blacks and black women of all economic stripes. It will probably also impress a number of white voters.
The video is worth watching if for nothing else to see how Obama works the crowd. He even jokes that at the beginning of the campaign he wasn't black enough -- and now he's "too black." He quotes comedian Chris Rock and chides the crowd for not setting high enough standards. It's already garnered over 100,000 views. One wonders if clips from the video will be used in spots later on down the line: