FILE - Democratic challenger Cal Cunningham speaks during a televised debate with U.S. Sen. Thom Tillis, R-N.C., Thursday, Oct. 1, 2020, in Raleigh, N.C. Cunningham has admitted to sending sexual text messages to a California strategist who is not his wife. Cunningham apologized but said he would not drop out of the race in a statement to multiple news outlets late Friday. (AP Photo/Gerry Broome, Pool, file)

U.S. Sen. Thom Tillis, R-N.C., right, speaks as Democratic challenger Cal Cunningham listens during a televised debate Thursday, Oct. 1, 2020 in Raleigh, N.C. (AP Photo/Gerry Broome, Pool)