Casey Cagle, Brian Kemp share their thoughts on 8 state issues Republican candidate for governor will be picked in July 24 primary runoff Lt. Gov. Casey Cagle and Secretary of State Brian Kemp will face off in a July 24 runoff in the Republican governor primary. The Times spoke by phone with both candidates seeking the Republican nomination for governor. These answers are in their own words. The two will be on the ballot in the primary runoff July 24.