Famed U.S. astronaut Buzz Aldrin appeared to endorse Sen. Martha McSally, R-Ariz., in her race against retired astronaut Mark Kelly, a Democrat. "Martha, check six - Mark? Buzz - over 100 jet hours in Arizona," the 90-year-old wrote on Twitter on Saturday. "12 o’clock is straight ahead. 6 o’clock is behind. Fighter pilots understand what 'check six' means in FTR lingo talk. Martha, wave as you move ahead past Mark, to 12 o’clock, and you win for Arizona!"