LETTERMAN APOLOGIZES TO PALIN

Under fire for a risque joke last week, David Letterman has apologized to Gov. Sarah Palin and her supporters. But a group urging CBS to fire the host says it's still not enough.

On CBS' "Late Show" tonight, Letterman says he's sorry about a monologue earlier this month in which he joked that New York Yankees star Alex Rodriguez impregnated Palin's daughter during a game. Letterman has said he intended the joke to be in reference to Palin's 18-year-old daughter Bristol, but Gov. Palin actually attended the game with her 14-year-old daughter Willow. Some critics have accused Letterman of joking about statutory rape.