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Vice President Lyndon B. Johnson is sworn in to the office of the Presidency aboard Air Force One in Dallas, Texas, hours after the assassination of President John F. Kennedy. Johnson is flanked by wife, Lady Bird Johnson (L), and First Lady Jacqueline Kennedy during the ceremony, which is being administered by U.S. District Judge Sarah Hughes. At farthest left in the background is Jack Valenti. (Photo by © Bettmann/CORBIS/Bettmann Archive)