(Matt York | The Associated Press) In this Oct. 15, 2018, file photo, U.S. Rep. Martha McSally, R-Ariz., goes over the rules in a television studio prior to a televised debate with U.S. Rep. Kyrsten Sinema, D-Ariz., in Phoenix. Democratic Rep. Kyrsten Sinema has won Arizona's open U.S. Senate seat, defeating McSally. The race between Sinema and McSally was one of the most-watched in the nation.