For the second time now, President Bush has failed to come up with any mistakes that he made during his presidency. The first time he was asked about this was during a press conference earlier this year.
Tonight, he brushed aside the question with something about how he had appointed some people who turned out to be a mistake.
So, what we have here is it's ALWAYS SOMEONE ELSE'S FAULT. George W. Bush does not make mistakes. Other people do.