President Barack Obama on David Letterman's
Enlarge JIM WATSON//AFP/Getty Images

President Barack Obama finishes his latest media blitz by joking with David Letterman during a taping of the "Late Show" in New York on September 21, 2009.

President Barack Obama on David Letterman's
JIM WATSON//AFP/Getty Images

President Barack Obama finishes his latest media blitz by joking with David Letterman during a taping of the "Late Show" in New York on September 21, 2009.

President Barack Obama completed the last stop of his latest media blitz by taping an appearance Monday afternoon on David Letterman's "Late Show." And it sounds like, for a few moments, the center of attention wasn't the world's most powerful man but a weirdly shaped tuber.

According to the Associated Press:

By the time Barack Obama came on stage to the taping of the "Late Show" on Monday, host David Letterman had offered up 10 reasons why in the world the president had agreed to do it.

Among Letterman's theories: Obama said yes without thinking about it, or as Letterman put it, "Like Bush did with Iraq."

But Obama had other ideas. It turns out he was listening when Letterman had bantered with a woman in the audience who brought - yes - a potato in the shape of a heart to the show.

Obama told Letterman: "The main reason I'm here? I want to see that heart-shaped potato."

The woman tossed the potato to Letterman. She agreed to let Obama keep it. Said the president: "This is remarkable."

Letterman covered a number of topics with Obama - many of them serious - in a taping that ran about 40 minutes. The show will be broadcast on CBS on Monday evening.