But wait, there's more!
From Michael Medved’s “The Blue-Eyed Rule”:
It turns out that in all of U.S. history, only five presidents had brown eyes – John Quincy Adams, Andrew Johnson, Chester A. Arthur, LBJ and Nixon. …Michael Medved: The Blue-Eyed Rule: Freakish Fact for Presidents' Day
[T]wo of our three presidents who faced serious impeachment proceedings (Andrew Johnson and Richard Nixon) were among our brown-eyed minority. The other three brownies (John Quincy Adams, Chester A. Arthur, and Lyndon Johnson) all hoped to win an additional term as president but failed to do, falling victim to bitter political critics and rivals.
The general incidence of blue eyes in the population is about 16% today. In 1950, it was estimated at 30%; in 1900, 50%. …
[O]ur population almost certainly never featured the 89% blue-eyed incidence of all our presidents. …”
[Updated 11/22/10 to correct expired link.]