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Portrait of American politican US Senate Majority Leader (and future US President) Lyndon B. Johnson (1908 - 1973), 1957. (Photo by Photoquest/Getty Images)

Portrait of American politican US Senate Majority Leader (and future US President) Lyndon B. Johnson (1908 - 1973), 1957. (Photo by Photoquest/Getty Images)

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2nd December 1963: American President Lyndon Baines Johnson addresses the nation on his first thanksgiving day television programme, broadcast from the executive offices of the White House. (Photo by Keystone/Getty Images)

2nd December 1963:  American President Lyndon Baines Johnson addresses the nation on his first thanksgiving day television programme, broadcast from the executive offices of the White House.  (Photo by Keystone/Getty Images)

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President Lyndon B Johnson with US Civil Rights leader Dr Martin Luther King Jr at the White House,Washington DC, December 1963. Dr King, head of the Southern Christian Leadership Conference, was one of the civil rights leaders who consulted with the new president. (Photo by Okamoto/PhotoQuest/Getty Images)

President Lyndon B Johnson with US Civil Rights leader Dr Martin Luther King Jr at the White House,Washington DC, December 1963. Dr King, head of the Southern Christian Leadership Conference, was one of the civil rights leaders who consulted with the new president. (Photo by Okamoto/PhotoQuest/Getty Images)

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In his Washington office, US president Lyndon B. Johnson (1908 - 1973) congratulates astronauts Virgil Grissom and John Young after their triple orbit of the Earth, 1965. (Photo by Gene Forte/Central Press/Hulton Archive/Getty Images)

In his Washington office, US president Lyndon B. Johnson (1908 - 1973) congratulates astronauts Virgil Grissom and John Young after their triple orbit of the Earth, 1965. (Photo by Gene Forte/Central Press/Hulton Archive/Getty Images)

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American president Lyndon Baines Johnson (1908-1973) poses with his wife Lady Bird Johnson in front of a fireplace at the White House, Washington, DC, circa 1966. (Photo by Hulton Archive/Getty Images)

American president Lyndon Baines Johnson (1908-1973) poses with his wife Lady Bird Johnson in front of a fireplace at the White House, Washington, DC, circa 1966. (Photo by Hulton Archive/Getty Images)