Krugman as Pollster

Krugman on the apparent Obama advantage:

But I suspect that the main reason for the dramatic swing in the polls is something less concrete and more meta than the fact that events have discredited free-market fundamentalism. As the economic scene has darkened, I’d argue, Americans have rediscovered the virtue of seriousness. And this has worked to Mr. Obama’s advantage, because his opponent has run a deeply unserious campaign.

That's basically my own suspicion as well. Plus, there's nothing Americans like more than "common sense" and, more than anything else, that's what Obama's selling.