According to Scott Ott. He really is an evil genius:

“I crave power,” Mr. Rove told the Journal, “and I can’t get my fix working for a lame duck president. I’ve been informally advising future President Clinton for about a year. I have a lot in common with Hillary – mostly notably the ice water that flows through our veins and the unbridled lust to rule the nation with an iron fist.”
President Bush plans to make a statement about the Rove resignation, as soon as he can find someone to tell him what to say.