Andrew Sullivan thinks it's about Cheney

The conservative blogger quotes a reader's interesting surmise and then adds his own postscript: "From the evidence we now have, it seems crystal clear to me that Libby knew he was out of line when he leaked the Plame name, and perjured himself to protect himself and the real source of the leak, Cheney. He gambled that the reporters wouldn't squeal; and that he could cleverly spin his phone conversations so that the information seemed to come from reporters, not him. The question now is whether he will now turn against his colleagues and master to save his own skin. This story is just beginning. Ultimately, it's about Cheney.
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