The folks at DU

are certain there's a nefarious reason for Edwards quitting.

"I don't want to overlook the fact that the powerful mega-corporations that DO run the show were being threatened by an Edwards administration, they even said so out loud.

One mustn't discount the possibility that the powers that be are capable of drastic measures to insure their control. Horrific threats is not out of the question. Perhaps not threats to Edwards, but maybe threats of some kind that would hurt innocent people somewhere.

I mean, come on, some of these people make a living off of a gigantic war machine, and manufacture events and propaganda to keep that machine rolling."

There's much more in that vein...