Patrick Fitzgerald...

...And for all we know Gerald fits Patrick because getting a straight answer from this guy seems to be impossible:

"In a December 14, 2005, letter to Fitzgerald, [Lewis] Libby's lawyers asked for "Any assessment done of the damage (if any) caused by the disclosure of Valerie Wilson's status as a CIA employee." In the same letter, Libby's team asked for "All documents, regardless of when created, relating to whether Valerie Wilson's status as a CIA employee, or any aspect of that status, was classified at any time between May 6, 2003 and July 14, 2003." (Those dates mark the period in which some Bush-administration officials discussed Wilson with reporters.) Fitzgerald declined both requests.

"A formal assessment has not been done of the damage caused by the disclosure of Valerie Wilson's status as a CIA employee, and thus we possess no such document," he wrote in a January 9, 2006, response. In any event, Fitzgerald argued, "we would not view an assessment of the damaged caused by the disclosure as relevant to the issue of whether or not Mr. Libby intentionally lied when he made the statements and gave the grand jury testimony that the grand jury alleged was false."

On the question of Wilson's status, Fitzgerald wrote, "We have neither sought, much less obtained, 'all documents, regardless of when created, relating to whether Valerie Wilson's status as a CIA employee, or any aspect of that status, was classified at any time between May 6, 2003 and July 14, 2003." Although Fitzgerald said that "if we locate" such documents, he might turn them over, he argued that he has no responsibility to do so, because they are not relevant to the perjury and obstruction of justice prosecution.
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Basically then, there was no harm done to national security. Which of course was the focus of the investigation. Libby didn't remember so that means he lied. His disremembering harmed no one but the law is the law and a tough prosecutor could find reason to send this to trial but it isn't a trial the government can win, so 9 out of 10 times he takes a pass. But not in this case.

Read the whole schmear over at National Review Online and try really really hard not to barf.