Dan Drezener says that Richard Clarke admires Bill Clinton because Clinton gave him power and despises George W. Bush because Bush took power away from him. Not an unreasonable reading, at first blush.
But note that the power Clarke accumulated under Clinton and lost under Bush was tied to a particular point of view: that al-Qaeda was a pressing threat to the US homeland. The decision to leave Clark in charge of counter-terrorism but to strip him of staff and make him report through Rice rather than directly to the President was a decision to downgrade the importance of the threat.
In a world dominated by uncertainty, having made a correct prediction is no proof of having had the right underlying model. Maybe the guy who was right when almost everyone else was wrong just drew to an inside straight. And of course every bureaucrat thinks his political masters would have been well-advised to take his expertise more seriously than they did.
Still, the past performance sheet has to count for something. Someone who got something important right when most other people didn’t deserves to be listened to. And those who didn’t listen to him before he was proven right by events can legitimately be asked whether their refusal to do so was a mistake.