John F. Kennedy was the last "zero factor" President. Since William Henry Harrison, every president who had been elected in a year ending in "0" died in office: William Henry Harrison who was elected in 1840 died in 1841. Abraham Lincoln who was elected in 1860 died during his second term in 1865. James A. Garfield who was elected in 1880 died in 1881. William McKinley who was elected to a second term in 1900 died in 1901. Warren G. Harding who was elected in 1920 died in 1923. Franklin Delano Roosevelt who was elected to his third term in 1940 died during his fourth term in 1945. John F. Kennedy who was elected in 1960 died in 1963. The trend was broken by Ronald Reagan who was elected in 1980, but lived to see the end of his second and final term.
