Ambinder concludes:
The basic demographic breakdowns suggest that the black/white split has widened as well (although I can't say too much about that now), which might mean that racial polarization (along with SES polarization) is driving the Democratic race to an unprecedented degree.
Um, yeah. Yeah, I'd say that when you have whites voting for your white candidate by a 2-to-1 margin, and blacks voting for your black candidate at a 9-to-1 margin, you do indeed have just a bit of a "racial polarization"/identity politics issue going on among your base of voters.
Just a bit of a problem with race in the Democratic Party. Race, race, race, Democrat, Democrat, Democrat...am I taunting a bit too much?
Ah, identity politics...as Rev. Wright might say, the chickens are a-comin' home to roost.