The debate will be streamed on the web here.
UPDATE: Sorry, I was watching the state Board of Education and missed just about everything but Gene Jeffress saying he had a fishing and hunting license and had lived in the district for about forever. (Unlike, presumably, Republican Tom Cotton, who ran some ads during the debate to remind any viewers that he'd be on the ballot in the fall to win a return to the Washington area, where he's spent most of his life since leaving Arkansas after high school graduation.)
UPDATE II: Roby Brock sums up. He didn't hear much to differentiate. The Democrats defended Social Security, something Tom Cotton most assuredly does NOT do.