Late night talk show host David Letterman on Monday acknowledged that Mitt Romney had enjoyed a resurgence in the polls after a great performance in his first debate with President Barack Obama.

But Letterman worried that the Republican presidential nominee might be getting "a little cocky" after seeing his version of the Psy's hit YouTube video, "Gangnam Style."

Watch this video from CBS' Late Night with David Letterman, broadcast Oct. 8, 2012.

(h/t: Mediaite)