A metro Atlanta congressman faces a one-on-one battle for re-election against a former sheriff who's a fellow Democrat, while primary races to fill three open U.S. House seats in Georgia have turned into sprawling contests between 19 total Republicans. As voters elect party nominees in Georgia's 14 congressional districts Tuesday, there are several standout races to watch. In eastern Georgia, five Republicans are fighting to be the GOP's chosen candidate to challenge the last white Democratic congressman in the Deep South — a race the national Republican Party badly wants to win in November.