From Mouthpiece to Whistleblower to Backtracker, Scott McClellan.

Mouthpiece:
Press Conferances Quotes, "I've made it very clear, from the beginning, that it is totally ridiculous," said McClellan at the time. "I've known Karl for a long time, and I didn't even need to go ask Karl, because I know the kind of person that he is, and he is someone that is committed to the highest standards of conduct."

Later, in an October 10 press conference the same year, "I spoke with those individuals, as I pointed out," said McClellan, "and those individuals assured me they were not involved in this. And that's where it stands.

Whistleblower:
Quote's from McClellan's book, "What Happened." "The most powerful leader in the world had called upon me to speak on his behalf and help restore credibility he lost amid the failure to find weapons of mass destruction in Iraq," writes McClellan. "So I stood at the White house briefing room podium in front of the glare of the klieg lights for the better part of two weeks and publicly exonerated two of the senior-most aides in the White House: Karl Rove and Scooter Libby."

"There was one problem. It was not true," he writes. "I had unknowingly passed along false information. And five of the highest ranking officials in the administration were involved in my doing so: Rove, Libby, the vice President, the President's chief of staff, and the president himself."

Backtracker:
Publisher, Peter Osnos of Public Affairs said that Mr. McClellan did not intend to suggest Bush lied to him ”about two senior aides’ roles in leaking the identity of Valeria Plame Wilson, a C.I.A. operative, to the conservative columnist Robert Novak and others in 2003.“He told him something that wasn’t true, but the president didn’t know it wasn’t true,'’ Osnos said in a telephone interview. “The president told him what he thought to be the case.'’

Where does the truth lie? As always, somewhere in the middle.