John McCain was an American politician and military officer who served as a United States Senator from Arizona from 1987 to 2018. He was the Republican nominee for president in 2008 and was a distinguished Navy officer and Vietnam War POW.
This is based on winning 13 head-to-head matchups with other famous people, but also losing 14 head-to-head matchups.
Most recently John McCain lost a matchup to Flea (musician) (#976) voted by someone from Denmark.