White nationalists are flocking to genetic ancestry tests -- but don't like what they find

It was a strange moment of triumph against racism: The gun-slinging white supremacist Craig Cobb, dressed up for daytime TV in a dark suit and red tie, hearing that his DNA testing revealed his ancestry to be only "86 percent European, and ... 14 percent Sub-Saharan African." The studio audience whooped and laughed and cheered. And…