Speaking of Mystery Sources
Rove-a-Palooza/Take a Letter from Libby/Miller's Crossing

This Daily Kos diary by pontificator offers a reminder of the mathematical equation of this whole affair: 1 x 2 x 6 (one senior administration official whistleblower, two senior administration official leakers, and six journalists). This comes from Mike Allen and Dana Priest's WaPo article from September 28, 2003:

Yesterday, a senior administration official said that before Novak's column ran, two top White House officials called at least six Washington journalists and disclosed the identity and occupation of Wilson's wife. Wilson had just revealed that the CIA had sent him to Niger last year to look into the uranium claim and that he had found no evidence to back up the charge. Wilson's account touched off a political fracas over Bush's use of intelligence as he made the case for attacking Iraq.

"Clearly, it was meant purely and simply for revenge," the senior official said of the alleged leak.

So, we have the six journalists (Tim Russert, Matthew Cooper, Glenn Kessler of the Washington Post, Walter Pincus of the Washington Post, Judith Miller, and Robert Novak) and the two senior administration officials (Karl Rove and Scooter Libby), but who's the singular whistleblower? Pontificator has an idea: Chief of Staff Andy Card, who showed in an Esquire article (from 2002)that he was not a big fan of the coming Karl Rove power grab with Karen Hughes about to leave the White House.