I am going to go out on a limb and make a prediction. The prediction is that the WH is not a target, but people within the CIA are. Not household names, but people acting in the role of (liberal activist) rogues within the CIA, whose goal was to politicize the WMD issue.
Joe Wilson should have reason to be nervous tonight as well.
And the original source of the leak is Mr. Richard Clarke.
I believe Novak identified them originally in his pertinent article as "in the administration, but not political gunslingers." Ever see Rove or Libby without their holsters firmly in place? LOL