You made my point by having to put [Fitzgerald] in brackets. Where's the quote from Libby himself? In his GJ testimony he is recalling what he "thought". Is Fitzgerald a mind reader? Maybe Libby did really think and say to himself "I've never heard of Valerie Plame" because that what he wanted Russert to believe.
Obviously, Libby isn't going to out and out say "I knew I looked up Plame's employment with the CIA in June when I told investigators that I first learned of Plame in July conversations with reporters." That would be an overt admission of perjury.
No, Fitgerald is not a mind reader, and he will have to make his case in court. But the contention that Libby did really think and say to himself "I've never heard of Valerie Plame" is counterbalanced by the fact that he cared enough, wondered enough, to go to the effort to call the CIA and ask for himself.
He's going to have to sell the amnesia excuse to the jury.