"The MSM and the dims want to get Rove because he is da man, the architect of the Bush presidencies and the bane of their existence. They're tired of getting Roved."
I think this effort was initially launched to try and shoot President Bush's campaign out of the water. When some of the MSM reporters tied Rove to the story--after the election--the leftist Democraps turned their guns on Rove. Unfortunately for them, the Dems have formed into a circular firing squad with the Wilsons in the middle.
Agree as to the initial aim of this scam: the target was President Bush. But the Rove card got played by Amb. Joseph C. Wilson IV (ret.) early in the game -- shortly after the Novak column appeared.
Recall Wilson's histrionics and his demand that Rove be "frog-marched out of the White House"?
Personally, I believe that the attack on Rove is an opportunistic venture by Wilson/Plame, et al, trying to take advantage of some "inside info". It's not unlikely, for example, that Judith Miller and Valerie Plame knew each other -- both worked on WMD issues. Wilson/Plame may have leaked Plame's role to Miller, who in turn leaked it to Rove and Libby -- thereby setting them up.
This scenario would explain a.) Miller's involvement in the case, even though she never authored a story concerning it and b.) why she (and her employer) would not want her source revealed.