On US TV, David Letterman made some jokes about Sarah Palin and one of her daughters. Sarah Palin and her husband went ballistic but seemed to think that Letterman was referring to her 14 year old daughter, whereas in fact he says he was referring to her 18 year old daughter. So here is David Letterman's reply on his show. It is worth watching. This demonstrates very well why Letterman has been at the top of his profession for thirty years.