Geoffrey Antell: Chief of staff, Senate Republican Whip John Thune (SD)

Geoffrey Antell is known for his strong policy chops, and he keeps bills moving on the floor for Senate Republican Whip John Thune (S.D.). Republicans are expected to take back control of the Senate in November, and Thune is a leading candidate to take over for Senate Republican Leader Mitch McConnell (Ky.). “If Thune’s going…