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WASHINGTON DC, UNITED STATES - NOVEMBER 22: Lyndon Johnson (C) taking oath of office after President Kennedy's assassination aboard Air Force One, Former First Lady Jackie Kennedy (R), imminent First Lady Lady Bird (L), Jack Valenti, Congressmen Albert Thomas on november 22, 1963 in United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

WASHINGTON DC, UNITED STATES - NOVEMBER 22: Lyndon Johnson (C) taking oath of office after President Kennedy's assassination aboard Air Force One, Former First Lady Jackie Kennedy (R), imminent First Lady Lady Bird (L), Jack Valenti, Congressmen Albert Thomas on november 22, 1963 in United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)