Thing is, what exactly can Fitzgerald pin on Cheney?
Suppose Cheney calls Rove and Scooter into his office and orders them to blow Plame’s cover. Is that gonna be on a written memorandum? Or just Cheney telling them to do something? What deal could Rove cut? “Cheney told me to do it!” Then Cheney says, “No, I didn’t!”.
Libby and Rove might concievably roll over on Cheney if they could get away with it. But they can’t. And they don’t WANT to roll over on Cheney, they’re part of the inner circle.
So, nobody’s going to be charged with “treason”, or charged with revealing that Plame worked for the CIA. It’s not even clear that would be a crime. What they are being charged with is perjury and obstruction of justice and all that. Meaning, lying to Fitzgerald about exactly what they did. But as has been pointed out, it’s easy to wiggle out of perjury charges…you can revise your statements to be closer to the truth on any question where another party who’s not firmly on your team could testify about. So if you had a converstation with a reporter, you’d better revise your testimony to match theirs. But if you had a conversation with Cheney? Stonewall, stonewall, stonewall, and they’ve got nothing.
As long as Cheney never talked to reporters himself, as long as all he did was talk to Rove and Scooter, he’s untouchable.