"Primary! Fight! Fight!"
I have to say that I agree with this: For all the hype, this isn’t an especially vicious primary race on the Democratic side. The fact that there aren’t large issue differences between Hillary Clinton and Barack Obama is lending their efforts to attack each other a bit of an odd vibe, but high-stakes political campaigns are always at least a little bit nasty.
The idea that this might open up some unbridgeable rift within the Democratic Party, meanwhile, strikes me as almost laughable. There ideological lines of cleavage within the Democratic coalition are much smaller than they were five or ten years ago when the party was riven by contentious arguments about globalization, etc.