Together they constitute an enormous contribution to the United States—one of the greatest of any former president."[309]
Truman taught occasional courses at universities, including Yale, where he was a Chubb Fellow visiting lecturer in 1958.[310] In 1962, Truman was a visiting lecturer at Canisius College.[311]

Politics
Truman supported Adlai Stevenson's second bid for the White House in 1956, although he had initially favored Democratic governor W. Averell Harriman of New York.[312] He continued to campaign for Democratic senatorial candidates for many years.[313]
In 1960 Truman gave a public statement announcing he would not attend the Democratic Convention that year, citing concerns about the way that the supporters of John F. Kennedy had gained control of the nominating process, and called on Kennedy to forgo the nomination for that year.[314] Kennedy responded with a press conference where he bluntly rebuffed Truman's advice.[315]
Despite his supportive stance on civil rights during his presidency, Truman expressed criticism of the civil rights movement during the 1960s. In 1960, he stated that he believed the sit-in movement to be part of a Soviet plot.