Tecumseh's Curse

Have you ever heard of Tecumseh's Curse? This proto-urban-legend claims that native American tribal leader Tecumseh so hated Willam Henry Harrison that he placed a curse upon him and every U.S. President that was elected in a year which ends in a zero. Of course, this is balderdash. It wasn't Tecumseh who cursed our presidential line, it was his brother, the Prophet. Let's see how well that curse worked out:

President	Elected	Died	Notes
Willam Henry Harrison	1840	1840	Harrison died of pneumonia and was the first US President ever to die in office.
Abraham Lincoln	1860	1865	Lincoln was shot by John Wilks Booth.
James A. Garfield	1880	1881	Garfield died was shot by Charles Julius Guiteau and died weeks later.
William McKinley	1900	1901	McKinley was shot by a Leon Czolgosz in his second term.
Warren G. Harding	1920	1923	Harding died of a heart attack.
Franklin D. Roosevelt	1940	1945	Roosevelt died during his third term from a stroke.
John F. Kennedy	1960	1963	Kennedy was shot by Lee Harvey Oswald.
Ronald Reagan	1980	2004	John W. Hinkley, Jr. almost killed Reagan in 1981. Reagan went on to become the longest-lived US President at 93 years of age.
George W. Bush	2000	?	As far as we can tell, he's breathing.

If we plot this information we get this chart: