I watched the whole debate and I didn't hear the bias, although I wasn't looking for it. Realistically, I don't care if the questions were biased. Bush is President after all, he should be able to deal with it. He didn't.
The only evidence of bias I saw clearly was that Lehrer kept trying to get Bush to attack Kerry. "Would we be more likely to face an attack if Kerry were eleceted?" "Do you think there are character issues which disqualify Kerry to be President?"
If he asked Kerry similar questions about Bush, I missed them.
Bush resisted the attack. I might not have been so strong.
Shalom.