I don't remember Bill Clinton serving any time for perjury.
Seems to me, based on what I've heard from some of the jurors, they seemed to be a bit on the "partison" side.
"What is HE doing here?"
"Where is Rove and all these other guys...."
"'We wish we weren't judging Libby...this sucks."
"Having Cheney testifying would have been interesting."
"I thought we might get to see President Bush here."
They had their claws out for Rove, Cheney and/or Bush the entire time.