Here's the clue
From the Washington Post:
"Over the weekend, Newsweek reported that Time magazine reporter Matthew Cooper, in an internal e-mail from July 2003, cited Rove as saying that administration critic Joseph C. Wilson IV, a former ambassador, had gone to Niger on a fact-finding trip involving Iraq's nuclear weapons programs at the behest of his wife. At the same time, according to Cooper's account, Rove also noted that she worked for the CIA on issues of weapons of mass destruction."
These come from notes Time released only after the Supreme Court denied protection of sources for Cooper and Miller. Up to now Rove has denied being involved at all. These documents contradict passed denials of both Rove and the White House regarding Rove's involvement in the Plame matter.
What we have here is another Bush administration lie to the American people.