He can't do it to begin with. Unless he does that martial law shit he passed with a signing statement a while back. It involved the ability to freeze congress and essentially make Bush a dictator. Maybe he could do it that way but as is now, he can't. Oh shit 
He could declare it so important a crisis, ...that the 2008 election must be called off . . .
...and then, we could see this come down to whoever controls the military, ...and who they are loyal to.

Y'all got your pots and pans ready?
