Matt Yglesias is largely right about this:

One thing I can predict is that you'll see a lot of handwringing about how this fight is dooming the Democratic Party. It's all, as best I can tell, total nonsense. Disagreeing about which of two strong leaders should go try to implement a pretty widely agreed upon vision of national policy is a healthy thing to do.

That's true, unless the divisions begin to fall more neatly around racial or gender lines. So far, there's enough ambiguity around the edges for this not to balkanize. But the lop-sided victories for Obama among African-Americans and the big advantage Clinton has among white women and Latinos could reverberate in divisive ways of the campaigns don't behave themselves.
 

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