In what looks like the same site RR posted, only an update, it says one side of cars were slurring Obama and the other side supported Hillary. Either these vandals want us to think it's Hillary supporters or it really is disgruntled HRC supporters.
In any case, and as sad as it sounds, I do hope they supply adequate protection for Obama. I honestly feel most people are perfectly fine with a black man running for President, but it's the crazies that we all know still exist, that worries me.

TIS
http://www.wftv.com/news/16738560/detail.html