Andy Card Victim of Rove-Libby Infighting?

Wild ass guess: Card's departure has to do with the reported infighting between Libby and Rove. At some point the PNAC ideologues were going to slam into the toady politicos like W and Rove. Libby was one of the original signatories to the PNAC Statement of Principles, along with this rogues gallery:

Elliott Abrams
Gary Bauer
William J. Bennett
Jeb Bush
Dick Cheney
Eliot A. Cohen
Midge Decter
Paula Dobriansky
Steve Forbes
Aaron Friedberg
Francis Fukuyama
Frank Gaffney
Fred C. Ikle
Donald Kagan
Zalmay Khalilzad
I. Lewis Libby
Norman Podhoretz
Dan Quayle
Peter W. Rodman
Stephen P. Rosen
Henry S. Rowen
Donald Rumsfeld
Vin Weber
George Weigel
Paul Wolfowitz

They're a pretty motley bunch; the Founding Fuck-Ups of post-Saddam Iraq.

When you get a chance some time, read Rebuilding America's Defenses [PDF]. It was so bald faced and revolutionary that they knew no one could by it at face value so they let out this little sigh on page 51:

Further, the process of transformation, even if it brings revolutionary change, is likely to be a long one, absent some catastrophic and catalyzing event a like a new Pearl Harbor.

Thank you UBL! From all your friends at the PNAC!