Rick Perry isn't letting a little "oops" bring him down. After last night's debate brainfreeze, Perry went on a media blitz, which he'll cap off on Thursday with an appearance reading David Letterman's Top 10 list. Asked earlier in the day if the gaffe would make him quit the race, Perry responded, “Oh, shoot, no. This ain’t a day for quitting nothing.” Perry failed to remember the third federal agency he wished to cut, despite hints from Ron Paul and incredulous questions from the moderator. "The third agency of government I would do away with—the Education, the Commerce. And let's see. I can't. The third one, I can't," Perry said. "Oops." Later he remembered it was the Energy Department.