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I doubt that Pres Cheney--in the event that the impeachment movement snowballs, as a I hope against hope it does--would come to pass. The Republicans would push Powell or someone like him into the VP slot if things really got to look bad for Bush.
I happen to agree with the most idealistic and pessimistic statements quoted in the article. I do believe there is a Constitutional crisis going on, and hope (still against hope) that the American people wake up to the increasing temperature of the water in our frog pot. We can't undo the last five years, but a chastened president and a congress that is carrying out it's Constitutionally mandated functions of oversight, check and balance would be a giant leap forward for the United States, even if that president's name were Cheney.