From Vox:
Some pretty extraordinary research, from UC Irvine's Michael Tesler, shows that racial issues have become especially polarized during the Obama era: basically, the fact that America's got a Democratic, black president means Republicans have grown more skeptical that structural racism is a huge, enduring problem.

For the full story, please visit http://www.vox.com/2015/6/19/8812663/charleston-shooting-republicans.