Here's the joke...

Here's the backlash...

Letterman referred to Palin, Alaska's governor, as having the style of a "slutty flight attendant." The "Late Show" host also took a shot Palin's daughter, while poking fun at the Yankees' third baseman.

“One awkward moment for Sarah Palin at the Yankee game," Letterman said, "during the seventh inning, her daughter was knocked up by Alex Rodriguez.”

But an even more disturbing fact, which Letterman may not have known, was that the daughter who accompanied Palin on her trip to New York was 14-year-old Willow—not 18-year-old Bristol, the unwed mother of Palin's first grandchild. Now, many critics—including the Palins themselves—are slamming Letterman for jokes that they say make light of sexual abuse of an underage girl.