OPINION:
I disagree.
I do not believe there will be wide-spread riots.
If Obama wins, the fist of political correctness will be one of the tools to suppress the polite (Conservatives, Conservative Christians, Conservative Jews) masses.
If McCain wins, there may be pockets of liberal hysteronics and possible small local area disturbances which law enforcement will deal with quickly.
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Off Topic: Jihadis are always probing for weakness no matter who wins.
for those libs that want blood:
http://www.youtube.com/watch?v=KKOOV1LbC3M