Everyone who goes to a job interview knows that there are several questions you should always be prepared to answer. One of those is some variant of "What is one of your weaknesses?"
Yesterday's "press conference" was Bush's job interview. When asked what his biggest mistake has been, he couldn't come up with one. He proved that he is either incapable of introspection or delusional. Last night, Bush couldn't answer a simple interview question and proved that he is unfit for the job of the presidency.