Pardon Me?

From Talking Points Memo by Joshua Micah Marshal

I havent seen this noted but i think the reason for the commutation is that a pardon would mean that Libby was no longer exposed to criminal sanctions and thus had no Fifth Amendment privilege. As it stands he has a fine and probation at stake during the pendency of the appeal which inulates him ( and Bush and Cheney) from havaing to answer questions before Congress.