The entire Valerie Plame affair was clouded by governmental agents that refused to tell the truth regarding the incident. Scooter Libby was indicted and found guilty of making false statements regarding this matter in a federal court. Libby certainly prevented justice from being served in this matter by making falsified statements to authorities. Libby, while perhaps not being the actual person who outed Valerie Plame, certainly had knowledge of the matter, and he refused to speak truthfully regarding the incident. By providing cover to those involved in the incident he denied justice for the outing of Valerie Plame, and he became guilty by association, even if not in deed, of the outing of Valerie Plame.
I do think Lewis "Scooter" Libby was guilty of outing CIA agent Valerie Plame. When it comes down to government officials and protecting them, we can't rest on our laurels. Libby's part in the matter caused him a lot of attention and revealed his character. I think the government did the right thing, but the media -- not so much.
The testimony is clear that it was Ms. Plame herself that gave an interview to a major news publication. Mr. Libby did not give the name of Ms. Plame. Since the special prosecutor had spent so much effort and money on proving his case he had to find Mr. Libby guilty of something. When it was clear that it was not Mr. Libby who disclosed Ms. Plame as a CIA agent the special prosecutor was able to have him convicted on other, lesser charges.
No, I do not think that Lewis Scooter Libby was guilty of outing CIA agent Valerie Plame, but he did lie under oath and so he deserved his punishment. The outing of Valerie Plame was obvious retaliation for the things the democrats had done. It was likely there were many people involved in outing Valerie Plame.
There is evidence suggesting that Lewis Libby took the guilty verdict with the assumption that he would be pardoned. He had lied to the court and was already facing charges for that. The deal could have been suggested that if he took responsibility for the outing of Plame as well, that the POTUS would be thankful for the sacrifice and pardon him of all charges. It is not convincing enough to believe he actually did the act.