Another issue, of course, is that as 56k pointed out, the media all know. 6 reporters and likely their editors know. Their two friends and their two friends all know. We will likely be treated to the spectacle, should they choose to cover this issue, of the media discussing this issue while pretending not to know.
Now, if anyone out there wants to leak it to me... ;)
...also, Marshall picks up on other point which quite a few of you suggested - who the hell told these two White House officials, who may or may not have proper clearance, about Wilson's wife in the first place? This likely goes deeper than two people.
Let's remember some words of wisdom from Poppy:
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Even though I'm a tranquil guy now at this stage of my life, I have nothing but contempt and anger for those who betray the trust by exposing the name of our sources. They are, in my view, the most insidious, of traitors.
Poppy doesn't think it's so complicated.
...and David E. has some comments on the whole anonymous sources issue.
...Another important question. Let's accept for now the perfectly plausible assertion that Bush didn't know anything about this. Even if he did, I don't think there's a snowball's chance in hell we're going to find that out. As Tim Dunlop says, "[I]t sounds to me like they suspect this story has legs and they are duct-taping and plastic-sheeting the President against any fallout."
However...that still leaves Big Time Dick Cheney. Shouldn't someone ask him what he knows about this? (He could, of course, be one of the "two," but even if he isn't he may have been behind it.)