Maureen Dowd makes a great point about Bush's answer to if he makes any mistakes:

After the Bay of Pigs, President Kennedy spoke to newspaper publishers and said: "This administration intends to be candid about its errors. For as a wise man once said, `An error does not become a mistake until you refuse to correct it.' . . . Without debate, without criticism, no administration and no country can succeed — and no republic can survive."

I think that was the 'killer moment' of the press conference. Either he is too dumb to think on his feet, or he is too arrogant to admit mistakes. I'm not sure which scares me more.