Derek Dooley, a former football coach, cast himself as an outsider candidate as the Republican primary field for a marquee midterm contest takes shape.

Former University of Tennessee football coach Derek Dooley has joined the GOP primary to decide who will go on to challenge Democratic U.S. Sen. Jon Ossoff. Dooley announced his campaign with a video message Tuesday morning.

Georgia is becoming a must-win state for Democrats. Ossoff’s midterms race may tell us a lot about the future of the Senate and the White House.