It's looking like Hillary is going to take it all the way to the convention, even if she has to tear apart the party to do it:

Adhering to [Mark] Penn’s fatal calculus, Clinton has endeavored to re-segregate the Democratic Party electorate into demographic segments and then pitted them against each other. The Clinton campaign has intentionally inflamed these simmering antagonisms: black versus Hispanic, black versus white, black versus older women, white collar versus blue collar, young versus old, under-educated versus college grad.

Back in the 1980s, Lee Atwater constructed an illusory Big Tent for Republicans, welcoming inside the Reagan Democrats—if only to soon betray their core interests. This was called the politics of expansion. In contrast, Clinton and Penn are cynically attempting to contract the Democratic base by provoking an internal Hobbesian free-for-all—total warfare of the factions.