U.S. Sen. John McCain, R-Ariz., speaks in support of U.S. Sen. Thad Cochran, R-Miss., as they appear together at a Cochran for Senate rally at the Mississippi War Memorial in Jackson, Miss., Monday, June 23, 2014. Cochran faces state Sen. Chris McDaniel, R-Ellisville, Tuesday in a runoff for the GOP nomination for senate. (AP Photo/Rogelio V. Solis)