Rep. Stephen Cohen (D-Tenn.) staved off a primary challenge from former Memphis Mayor Willie Herenton Thursday. 

Cohen, who's white, took almost 80 percent of the vote in the majority black district. Herenton, an African American, had run a campaign based mostly on race. Still, Cohen got the backing of the Congressional Black Caucus. He was also endorsed by President Obama. "You don't ask, you don't get," he told The Hill.

Cohen now faces Republican tea party candidate Charlotte Bergmann, an African-American woman, in the general.

--Updated at 1:12 p.m. Aug. 6