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Bob Woodward learned about Valerie Plame, International Woman of Mystery, over 2 years ago from a top administration official who was not Scooter Libby. The famed Watergate sleuth protected his source and kept the information to himself. After all, that's what he's famous for. But silence is a sin in media ethics these days and sources must be confessed to Inquisitor Fitzgerald.
Judging by Father Fitzgerald's busy confessional, the Plame name seems to have gotten around quite a bit among members of the Washington Media Church.
I'm sure Fitzgerald is on the warpath now; he staked his whole Scooter Libby indictment (or at least the media press conference) on the fact that Scooter was the first administration official responsible for the leak. That charge was for lying to FBI investigators, incidentally, and not outing an agent. Maybe he'll get the Martha Stewart cell.