The point is that this administration's political triumphs have never been based on its real-world achievements, which are few and far between. The administration has, instead, built its power on myths: the myth of presidential leadership, the ugly myth that the administration is patriotic while its critics are not. Take away those myths, and the administration has nothing left.
Meanwhile, the Plame inquiry, however it winds up, has ended the myth of the administration's monopoly on patriotism, which was also fading in the face of the war. Apologists can shout all they like that no laws were broken, that hardball politics is nothing new, or whatever. The fact remains that officials close to both Mr. Cheney and Mr. Bush leaked the identity of an undercover operative for political reasons. Whether or not that act was illegal, it was clearly unpatriotic.