Another Republican House incumbent lost a primary for higher office

House Republican Diane Black lost the hotly contested Tennessee GOP gubernatorial primary on Thursday, making her the fifth House Republican this election cycle to lose a primary for statewide office. It's a potentially ominous sign for Republicans as the party fights to hold its majority in Congress this fall. Black, who had a shot at becoming Tennessee's first female governor, had forfeited the powerful Budget Committee chair position in the House in her bid for the governorship.