Who did Senator John Glenn run against for president?

Senator John Glenn ran for president in the 1984 Democratic primary. His main opponents included former Vice President Walter Mondale, who eventually became the party's nominee, and other candidates like Gary Hart and Jesse Jackson. Glenn's campaign focused on his experience as an astronaut and senator, but he struggled to gain significant traction against the more prominent candidates. Ultimately, Mondale secured the nomination and went on to run in the general election.