Recent polling shows that almost 30 percent of Clinton supporters and nearly 20 percent of Obama supporters say that if their preferred candidate doesn't win the nomination, they'll vote Republican.
I'd thought that some of the divisions in the Democratic party were largely superficial. Differences on policy positions between Hillary and Obama aren't that significant; hell, some of their own handlers call them "nuanced", which seems code for "once we find out how our candidate is different from their candidate we'll let you know."
Besides that, there seem to have been some obvious attempts to fiddle the Democratic primary results.
The NPR story seems to indicate a deeper division. Makes me wonder if the Democrats will hand the Presidential election to the Republicans, just like they did in 2004.