I read this on another thread. The fact is, the questions to Kerry were pretty conventional and predictable. Bush got weird questions like the character one. Kerry answered each question as follows: Give a one-sentence response to the question, then blather on about what you really want to talk about. He looked as if he knew the questions because he knew the answers, independent of what the questions were.
I reject these conspiracy theories. I wouldn't be surprised if somebody at PBS wanted to copy the questions and send them to Kerry, but I doubt it happened. Lehrer has his biases but he's not as insane as Rather.