Because Liz Carter is white, she’s banned from debating Democrat Rep. Hank Johnson and the other black candidates running for his Georgia congressional seat at a candidate forum in Atlanta tonight. The forum, moderated by Newsmakers Live, is solely for the black Republicans and Democrats running for Johnson’s 4th Congressional District seat, Carter took to the Internet to say. Carter, a Republican, expressed her disappointment on Twitter Wednesday, asking, “What happened to diversity?” “We called them, we asked to participate,” said Carter’s campaign manager, Cheryl Prater. But she said Newsmaker Live’s event moderator, Maynard Eaton, told the campaign that because...