Did Bush Lie about Valerie Plame?

Has Bush been lying to the American people about who outed Valerie Plame since July of 2003? There are an endless number of questions involved here. Josh Marshall has some questions:

Here's a question. If I understand this right, Scooter Libby has sworn under oath that Vice President Cheney told him that President Bush had authorized him to disclose classified information.

(snip)

If it isn't true that Vice President Cheney told him that, then Vice President Cheney must know that Libby has again perjured himself. I would think the Vice President has an affirmative duty to come forward and say that Libby's testimony is false.

If Libby is at least telling the truth about Cheney (but maybe not the date which may have been earlier), then Bush and Cheney have been sitting on the truth for almost three years despite a legal investigation. That amounts to an obstruction of justice.

It's time that Bush and Cheney be questioned separately and under oath. If the courts have decided a sitting president can be questioned about a silly sex affair, it is absolutely essential that Bush and Cheney be questioned about a crucial national security crime involving the outing of covert CIA agent Valerie Plame. Remember what Libby may really be saying: the outing of Valerie Plame was no accident, it was deliberate.