david letterman is an a** and always has been. He's been doing this for 30 years and knows exactly which daughter he was referring to. I find it very hard to believe that with his massive behind the scene team that he was confused about the facts. Politicians are fair game but their children should be off limits, especially to sick old pervs looking for a laugh. I wonder if it would be brushed off as a misunderstanding if it were one of the obama girls he was talking about...think not.