In the AP:
McClellan was ordered to say that White House aides Karl Rove and I. Lewis “Scooter” Libby were not involved in leaking Plame’s identity. Later, a criminal investigation revealed that they were.
Unless the writer is using the word “involved” very expansively, the investigation revealed no such thing. We’ve known for over nine months that Richard Armitage was the one who leaked Plame’s identity, and he did it without any involvement from the White House.