While we're wringing our hands about the resistance of white working-class voters and older voters to Barack Obama, and aboutdefections to McCain if he's the nominee, let's not forget this statistic (from page 5 of the CNN exit poll for Pennsylvania):
One out of every voters in this primary registered as a Democrat within the past three months. And 62% of those newbies voted for Obama. And that's after Reverend Wright and "bitter" and a bad debate.
Even in a loss, he still brings people into the fold and gets them to the polls. Does that offset defections by traditional Democrats? I don't know, but the narrative right now is all about those defections and nothing else -- and that's not the whole story.