If anyone finds a site w/ odds on the type of perpetrator, please post a link.
I'll throw a guess out there, and I'm far from an expert.
5-1 Muslim 7-1 Right Wing Kook 15-1 Mental Patient w/o Right Wing Agenda 25-1 North Korean 50-1 Latina American Drug Cartel 1000-1 Al Davis' Ghost 10,000-1 Church of Scientology
I would think a great place to look is to find where Obama's BFF Bill Ayers has been.