In 1968, Eugene McCarthy was the antiwar candidate for the president.
Explanation:
Eugene McCarthy was an American politician as well as poet. From 1949 to 1959 he was the part of US House of Representatives and later from 1959 to 1971 in the US Senate. He worked as a code-breaker for the US Department of War during second world war.
He participated five times in presidency but never won. McCarthy was not the perfect candidate and he did not get nominated but he came ahead when antiwar force wanted him the most.