Gawker says a bunch of students from University of Mississippi got together to riot when President Obama won reelection:

Local media reports that "hundreds of Ole Miss students exchanged racial epithets and violent, politicized chants" across campus. As many as 400 students are said to have participated. There are also reports that several students were arrested during the protest, though none have been officially charged. There were mixed reports about whether or not rocks were thrown as well.

Ole Miss has apologized.