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Portrait of American politician and diplomat Adlai Stevenson (1900 - 1965) as he speaks behind a WNYC microphone, New York, New York, 1952. (Photo by Fred Stein Archive/Archive Photos/Getty Images)

Portrait of American politician and diplomat Adlai Stevenson (1900 - 1965) as he speaks behind a WNYC microphone, New York, New York, 1952. (Photo by Fred Stein Archive/Archive Photos/Getty Images)

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An American presidential election badge for Democratic candidate Adlai Stevenson II, circa 1952. (Photo by Tony Evans/Getty Images)

An American presidential election badge for Democratic candidate Adlai Stevenson II, circa 1952.  (Photo by Tony Evans/Getty Images)

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circa 1955: American Democratic politician Adlai Stevenson (1900 - 1965), he was twice defeated by Dwight Eisenhower in the Presidential election of 1952 and 1956. (Photo by MPI/Getty Images)

circa 1955:  American Democratic politician Adlai Stevenson (1900 - 1965), he was twice defeated by Dwight Eisenhower in the Presidential election of 1952 and 1956.  (Photo by MPI/Getty Images)

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American politician and Governor of Illinois Adlai Stevenson II (1900 - 1965) smiles, New York, New York, 1960. (Photo by Robert R. McElroy/Getty Images)

American politician and Governor of Illinois Adlai Stevenson II (1900 - 1965) smiles, New York, New York, 1960. (Photo by Robert R. McElroy/Getty Images)

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Portrait of American politician, Illinois governor, two-time US presidential candidate, and US Ambassador to the United Nations Adlai Stevenson (1900 - 1965) seats in a red leather chair, a newspaper in his hands and a globe to his side, Illinois, 1961. (Photo by Bachrach/Getty Images)

Portrait of American politician, Illinois governor, two-time US presidential candidate, and US Ambassador to the United Nations Adlai Stevenson (1900 - 1965) seats in a red leather chair, a newspaper in his hands and a globe to his side, Illinois, 1961. (Photo by Bachrach/Getty Images)