Franklin Roosevelt was the first president to appear on TV. Roosevelt spoke at the opening session of the New York World's Fair on April 30, 1939 and the speech was broadcast via television to a very limited audience.
On October 5, 1947, Harry Truman spoke on TV in a speech from the White House. That was the first nationally televised Presidential address. The speech asked Americans to conserve grain in order to help the starving Europeans. (Dwight Eisenhower was the first to appear on color TV in 1955.)
president surved 2 years in fourth term
For the US; just Kennedy in '63.
Franklin Roosevelt was the first president to take office on the inaugural date specified by the Twentieth Amendment.
Less than 4 months