George McGovern was a congressman and a senator from South Dakota, but he is best remembered for losing the 1972 presidential campaign to Richard Nixon. His crushing defeat in that election reshaped the American political culture, shifting more power to the right. McGovern had been heir to the prairie populism that was a feature of the Democratic Party’s liberalism. As he became more politically and morally opposed to the war in Vietnam, he made a run for the presidency. Capitalizing on the Democrats’ new primary procedures, which he had helped write, McGovern won an unlikely nomination. Larry Rivers’s campaign poster moves from a crossed-out sketch of President Nixon to a smiling photograph of McGovern, suggesting that the Democratic nominee could put the country’s scattered pieces back together.