Fred covers it in this article from around the turn of the century. http://www.fredoneverything.net/Blowup.shtml
And the last paragraph:
It had better not happen, but it could. Any spark could light it. One day the underclass, rioting, may go into white neighborhoods to stomp and burn. They won’t expect resistance, because they have never met it. I don’t think Al and Jesse quite know how many deer guns, how many Weatherbys and .223s sit quietly in closets out here. If a mob comes toward a man’s home, where his wife and children are, the results will be astonishing. The police will immediately polarize, black versus white. So will everybody else. Government will be irrelevant. And the whole country just might blow up.
It wont happen under a lib POTUS like Obama. He will stop it in the usually way. A moving speech to them to be peaceful, and some extraordinary actions against Zimmerman by Holder.
Expect signs and peaceful but vocal protests too.
Now if a R was POTUS the game would change completely, burning and looting would be blamed on him.
The fact that Obama anticipated Republicans every move last year and used them all effectiively against them tells you that he would use it to his favor, not some wishful thinking here that would hurt his causes.