President Obama made an appearance on the Late Show with David Letterman on Monday, his first since being elected president. Mixing humor with talk about serious issues, Obama offered a sober prediction that unemployment would continue to be a "big problem" for the next year and pointed out that the war could be lost in Afghanistan without more troops. 

His funniest line of the night came when Letterman asked him what he thought of Jimmy Carter's assertion that some of the vitriolic reaction at town hall meetings to his healthcare plans is at least partly driven by racism.

"First of all, I think it's important to realize that I was actually black before the election," Obama quipped to big laughs.

Letterman quickly shot back with, "How long have you been a black man?" (AP)

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