"The jury just didn't believe his defense against the particular charges.
Piss poor case though."
I must not be expressing myself clearly. "Innocent until proven guilty" means to me Libby starts the trial innocent. The prosecution must prove beyond a reasonable doubt he perjured himself. Libby's defense was that he had a bad memory. The jury said they convicted him on Russert's testimony. No matter how convincing Russert was, if his testimony contradicted Libby's, that's only one against one. That's not beyond a reasonable doubt.
Libby doesn't have to prove himself innocent--the prosecution must prove him guilty.
...and the FBI claims that they LOST the notes of their conversation with Russert. It stinks.