John Glenn of the Mercury Seven. Glenn resigned from NASA in January 1964. He planned to run for a U.S. Senate seat from Ohio, but an injury in February 1964 forced his withdrawal. He retired from the Marine Corps the following year. He lost a close primary election in 1970. A member of the Democratic Party, Glenn first won election to the Senate in 1974 and served for 24 years until January 1999. In 1998, while still a sitting Senator, Glenn flew on the "Discovery" space shuttle's STS-95 mission, and became the oldest person to fly in space and the only person
John Walsh (U.S. senator) October 3, 2013, Walsh announced his intention to run for the seat of retiring Senator Max Baucus. On February 9, 2014, Walsh was appointed to replace Baucus in the Senate after Baucus stepped down early to become U.S. Ambassador to China, making Walsh the incumbent in the race. Rancher Dirk Adams and former Montana Lieutenant Governor John Bohlinger also ran for the Democratic nomination. Walsh was endorsed by Governor Bullock, Senator Jon Tester, and former Senator Baucus, an arrangement which was criticized by his opponent as being "politically motivated", designed to give Walsh an advantage in the election by making