I think almost all of Lehrer's questions to Kerry were "Do you think the president has stopped beating his wife?" and his questions to Bush were "Mr. President, have you stopped beating your wife?"...
Yeah, I noticed that too.
At one point, I turned to my wife and said "have you noticed all the questions are 'Sen. Kerry, please tell us how Bush is a screw up,' or 'Mr. President, do you regret you screwed up on [fill in]'?"
You nailed it! That is just what I was thinking while watching it. Lehrer was asking over and over in different ways "Has President Bush stopped beating his wife?". I think that is why President Bush looked so angry.