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Portrait of American politician US Senator and Democratic Majority Whip Hubert Humphrey (1911 - 1978), 1961. (Photo by PhotoQuest/Getty Images)

Portrait of American politician US Senator and Democratic Majority Whip Hubert Humphrey (1911 - 1978), 1961. (Photo by PhotoQuest/Getty Images)

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Portrait of American politician and US Vice President Hubert Horatio Humphrey Jr. (1911 - 1978), as he sits at a desk 1960s. He served as vice president, from 1965 - 1969 ,under Lyndon B. Johnson, as well as holding positions in Congress and as mayor of Minneapolis, Minnesota. (Photo by Bachrach/Getty Images)

Portrait of American politician and US Vice President Hubert Horatio Humphrey Jr. (1911 - 1978), as he sits at a desk 1960s. He served as vice president, from 1965 - 1969 ,under Lyndon B. Johnson, as well as holding positions in Congress and as mayor of Minneapolis, Minnesota. (Photo by Bachrach/Getty Images)

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Vice-President Hubert H Humphrey and his wife Muriel wave as they depart from a Asian trip, Washington DC, January 3, 1966. (Photo by PhotoQuest/Getty Images)

Vice-President Hubert H Humphrey and his wife Muriel wave as they depart from a Asian trip, Washington DC, January 3, 1966. (Photo by PhotoQuest/Getty Images)

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American Democratic politician Hubert Humphrey (1911 - 1978) talks to the press. Original Publication: People Disc - HD0100 (Photo by Hulton Archive/Getty Images)

American Democratic politician Hubert Humphrey (1911 - 1978)  talks to the press.  Original Publication: People Disc - HD0100   (Photo by Hulton Archive/Getty Images)

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13th October 1965: American Democratic politician Hubert Humphrey (1911 -1978), vice-president during the Johnson administration. (Photo by Harry Benson/Express/Getty Images)

13th October 1965:  American Democratic politician Hubert Humphrey (1911 -1978), vice-president during the Johnson administration.  (Photo by Harry Benson/Express/Getty Images)