https://cdnph.upi.com/ph/st/th/3531786367423/2026/upi/0480e56648b3af5fd55fc9a66aabaa38/v1.5/Darline-Graham-Ralph-Norman-runoff-set-for-Sen-Lindsey-Grahams-seat.jpg" /> South Carolina Republicans are set to head to the polls Tuesday to select a nominee for November's election to replace the late Sen. Lindsey Graham.