A thoughtful observation from James Fallows:

I remember how often, how vehemently, and with what certainty Obama’s detractors during the Democratic primaries said that he could not, possibly, in any way, in any real world, withstand the onslaught of GOP negative campaigning once it geared up against him. That he’s been seriously underestimated twice — by the Hillary Clinton camp, and now by McCain — doesn’t prove his potential in office but is interesting.