I'm just going to quote Mark Kleiman:

I had hoped that Hillary Clinton's use of two African-American surrogates to make the borderline-racist "We can't nominate a black man" case against Barack Obama would backfire, as it deserved to. Looks as if Obama has figure out a way to make that happen.

I have to say that I wonder whether the Clinton campaign really wants to go there. The polls indicate that being a woman is a smaller electoral handicap than being a Mormon (Romey), 72 years-old (McCain), or on a third marriage (Giuliani), but a larger one than being an African-American. It would be unfortunate for the party to get bogged down in an ugly dispute over this, and I hope the issue will drop, but it makes a lot more sense as something for John Edwards' camp to raise.