WHAT DID KARL ROVE KNOW and when did he leak it?

NEWSWEEK is reporting that Karl Rove's name is mentioned as a source in Matt Cooper's story that outed Valerie Plame as an undercover CIA agent. Could it be? If it's true, did Karl Rove break the law? And if he did, shouldn't he then be asked to resign from the White House?

OR --- could it be the liberal left clamoring for anything -- ANYTHING to take down this man they hate so much?