Remaining to be decided are an open U.S. Senate seat and two open U.S. House seats, the nation's last congressional races.
Republican Senate candidate John Kennedy drew star power for his closing argument Friday. President-elect Donald Trump headlined a Baton Rouge rally, urging voters to support Kennedy.
Democratic Senate candidate Foster Campbell spent his final day ahead of the runoff having a barbecue lunch with supporters in Alexandria, before heading to a Lake Charles union hall.
Secretary of State Tom Schedler predicted turnout could dip below 30 percent. Polls open at 7 a.m. Saturday and close at 8 p.m.