Former U.S. Attorney General Michael B. Mukasey, quoted in the WSJ:

How did we get to where we are today? Even before the 2008 election, the warning signs were there. The man who was to become U.S. Attorney General told an audience during the election campaign that the Bush administration had permitted abuses in fighting terrorism. He said there would have to be "a reckoning." During his subsequent tenure, in a moment of unguarded candor, he described himself as the President's "wingman." From the standpoint of the Justice Department, I can't overstate the demoralizing significance of an attorney general saying something like that. If I had ever described myself, during my tenure, as President Bush's wingman, I would have expected to come back to find the Justice Department building empty and a pile of resignations on my desk. Even Attorney General Robert Kennedy, President Kennedy's brother, to my knowledge never described himself in such terms. Yes, the attorney general is a member of the administration--but his principal responsibility is to provide neutral advice on what the law requires, not to fly in political formation.