This case's importance lies not in the narrow charge that Libby committed perjury in testifying about his role in the outing of CIA operative Valerie Wilson; that was merely one facet of a far-ranging plot to deceive Congress and the public about perhaps the most important issue of our time: The prospect of terrorists obtaining a weapon of mass destruction.
The Libby case testimony, centered on the chicanery of the vice president, certainly suggests that impeachable offenses occurred on the highest level of the White House. Just how conscious the president was of the deceits conducted under his authority, what he knew and when he knew it, is precisely what an impeachment trial would determine (my em).
Testimony already has established that Libby was nothing more than a pawn used by Cheney in the vice president's constant and ferocious campaign to trick the nation into war -- not a totally surprising quest for a man who had served as CEO for a corporation that has profited so obscenely from the Iraq agony.
Much, much more. Please go read.