Late Show with David Letterman

Jimmy Fallon, Neil Young, Lupe Fiasco (19x130)

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Ahmadinejad at the U.N.; a New Mitt Release; Mitt on the Campaign; the Zogby Poll; and a CBS Promo. Jimmy Fallon - star and host of "Late Night with Jimmy Fallon." And he's the executive producer of the new NBC show, "Guys with Kids," Wednesdays at 8:30. Neil's "music player" is called the Pono. It promises to be better than anything you've experienced before. He shows off the prototype at the desk.