From a pool report, here is David Letterman's Top 10 list tonight -- Reasons why President Obama agreed to do "Late Show."

10. Heard the lady with the heart shaped potato was gonna be here. (a reference to a woman in the audience).

9. Thought it would be fun to watch someone else get heckled. 8. Something to do with that whole cash for clunkers deal.

7. Every president since Teddy Roosevelt has done it.

6. Someone offers you 600 bucks you take it ladies and gentlemen.

5. We told him Megan Fox would be here.

4. Needed some time to hang out before check in time at his hotel.

3. I have no idea.

2. Said yes, without thinking, like Bush did with Iraq.

1. Wanted to congratulate Dave on the big Emmy win.

During the interview with Obama, Letterman asked him about Jimmy Carter's race comments. Obama quipped, "It's important to realize that i was actually black before the election." Sidestepping it somewhat, he continued: "So the American people, I think, gave me this extraordinary honor. That tells you a lot, I think, about where the country is at."