If both are true, then he didn't lie. I often have confidetntial information on clients that when it becomes public, I site the public source as my souce. Would I be lying if I site my public source rather than my private source when both are true statements? What if later I forget my private source gave me the info first, is that deliberate?
That's the question. Whether or not Libby confused (or forgot, as it appears to be per evidence in the indictment) his "private source," his initiative to call the CIA and obtain an authoritive answer, with his "public source," reporters.
Did he deliberately mislead investigators? Or was the lapse in informing investigators of his repeated calls to the CIA mere forgetfulness on his part?
As the potential sources mount up they task for Fitz gets harder. The defense will argue that even today Fitz has no idea who the source was and how it evolved. Everyone is just as confused today as they were 2 years before this was intensely investigated. Is it any wonder that Libby was confused?