UPDATE: In a statement, Sesame Workshop requested that the campaign take down the ad. "Sesame Workshop is a nonpartisan, nonprofit organization and we do not endorse candidates or participate in political campaigns. We have approved no campaign ads, and as is our general practice, have requested that the ad be taken down."
Democrats might worry that if this is the best the candidate can do post-debate, it's not a good sign. But rest assured. The Obama campaign has been keeping up with the Romney campaign in cranking out hard-hitting negative ads since last week.