 In 1923, upon being informed of Warren Harding's death, while visiting his family home in Plymouth Notch, Vermont, Calvin Coolidge was sworn in as president by his father, John Calvin Coolidge, Sr., a notary public.Most recently, federal judge Sarah T. Hughes administered the oath of office to Lyndon B. Johnson aboard Air Force One after John F. Kennedy's assassination on November 22, 1963.Since 1789 there have been 58 inaugural ceremonies to mark the commencement of a new four-year term of a president of the United States, and an additional nine marking the start of a partial presidential term following the intra-term death or resignation of an incumbent president.