U.S. Senate candidate Jack Kingston spoke to the South Hall Republican Club last month, and Monday night was Republican rival David Perdue’s turn to address local conservatives. The two will square off July 22 in a runoff for the Republican nomination. The winner will face Democrat Michelle Nunn and Libertarian Amanda Swafford of Flowery Branch in the general election Nov. 4 to fill the state’s Senate seat being vacated by Saxby Chambliss.