Think Progress 23 Administration Officials Involved In Plame Leak: The cast of administration characters with known connections to the outing of an undercover CIA agent:

Karl Rove
I. Lewis "Scooter"Libby
Condoleezza Rice
Stephen Hadley
Andrew Card
Alberto Gonzales
Mary Matalin
Ari Fleischer
Susan Ralston
Israel Hernandez
John Hannah
Scott McClellanDan Bartlett
Claire Buchan
Catherine Martin
Jennifer Millerwise
David Wurmser
Colin Powell
Karen Hughes
Adam Levine
Bob Joseph
Vice President Dick Cheney
President George W. Bush

Think Progress has a nice set of links to each person with an explanation of why and howhe or she made the list.