The Republicans portrayed Mr. McGovern as a cowardly left-winger, a threat to the military and the free-market economy and someone outside the mainstream of American thought. Whether those charges were fair or not, Mr. McGovern never lived down the image of a liberal loser, and many Democrats long accused him of leading the party astray.

Mr. McGovern resented that characterization mightily. “I always thought of myself as a good old South Dakota boy who grew up here on the prairie,” he said in an interview for this obituary in 2005 in his home in Mitchell. “My dad was a Methodist minister. I went off to war. I have been married to the same woman forever. I’m what a normal, healthy, ideal American should be like.

“But we probably didn’t work enough on cultivating that image,” he added, referring to his presidential campaign organization. “We were more interested in ending the war in Vietnam and getting people out of poverty and being fair to women and minorities and saving the environment.

“It was an issue-oriented campaign, and we should have paid more attention to image.”

The 1972 Nomination

Mr. McGovern was 49 years old and in his second Senate term when he won the 1972 Democratic nomination, outdistancing a dozen or so other aspirants, including Senator Edmund S. Muskie of Maine, the early front-runner; former Vice President Hubert H. Humphrey, the nominee in 1968; and Gov. George C. Wallace of Alabama, a populist with a segregationist past who was gravely wounded in an assassination attempt in Maryland during the primaries.

Mr. McGovern benefited from new party rules that he had been largely responsible for writing, and from a corps of devoted young volunteers, including Bill Clinton and Hillary Rodham, who took time off from Yale Law School to work on the campaign in Texas.

The nominating convention in Miami was a disastrous start to the general election campaign. There were divisive platform battles over Vietnam, abortion, welfare and court-ordered busing to end racial discrimination. The eventual platform was probably the most liberal one ever adopted by a major party in the United States. It advocated an immediate withdrawal from Vietnam, amnesty for war resisters, the abolition of the draft, a guaranteed job for all Americans and a guaranteed family income well above the poverty line.