Only one reason for that I can see.
If the election is perceived as being rigged, if the Diebold states go McCain in spite of other indications, if they manage to obfuscate the election and get it into Scalia's hands again, I believe there will be a big problem with civil unrest. I just don't think folks are going to tolerate another 2000 or 2004 without a fight.
And the US Army along with Blackwater will be used mercilessly. I don't see anything stopping these people, really. Nothing has so far.
Arf
