NEW YORK (CNN) -- President Obama mixed policy discussion with personal reflections on his daughters and, yes, a few jokes in an appearance on CBS' "Late Show With David Letterman." President Obama jokes with David Letterman in New York in an interview taped Monday afternoon. It was the first time a sitting president has been a guest on the popular late-night entertainment show, according to the CBS Web site. It was taped Monday afternoon. After taking the stage to a huge ovation, Obama teased Letterman about being surprised to see the event on his daily schedule, saying: "That's one of those where you ask your advisers, 'Who's responsible for this?' "President Obama's visit first time a sitting president has been "Letterman" guestObama says he'll ask "tough questions" before sending more troops to AfghanistanPresident says he doesn't think racism fuels opposition to health care overhaulWhat did daughters Malia and Sasha do this summer? They "goofed off," he says
_ quickly quipped: "Well, others have," prompting a big laugh from both the audience and the president.