Mr. McReynolds was best known for his demonstrations against the draft during the Vietnam War, his advocacy of pacifism and denuclearization, and his two bids for president in 1980 and 2000 as an openly gay man running on the Socialist Party USA ticket. He first gained wider public attention as a candidate for Congress in 1958. Mr. McReynolds spent almost four decades as a staff member for the War Resisters League, a pacifist organization based in New York City. His activism took him around the world for demonstrations and meetings as a member of delegations in Libya, Japan,Vietnam and other countries. David Ernest McReynolds was born on Oct. 25, 1929, in Los Angeles. He was raised as a Baptist and was once affiliated with the Prohibition Party, he told The Village Voice in a 2015 interview. By the time he attended the University of California, Los Angeles, in the early 1950s, he had become an active socialist and an ardent pacifist. He is survived by a sister, Elizabeth Gralewski, and a brother, Martin McReynolds.