Eight US Presidents were/are left-handed:

James A. Garfield (R)

Herbert Hoover (R) (disputed)

(R) (disputed) Harry Truman (D) (may have been ambidextrous)

(D) (may have been ambidextrous) Gerald Ford (R)

Ronald Reagan (R) (switched to right hand for writing in school; perhaps ambidextrous)

(R) (switched to right hand for writing in school; perhaps ambidextrous) George H.W. Bush (R)

Bill Clinton (D)

Barack Obama (D)

More Trivia In the 1992, 1996, and 2008 presidential elections, all major candidates were left-handed: H.W. Bush, Clinton, and Perot; Clinton, Dole, and Perot; McCain and Obama respectively.

The eight left-handed US Presidents constitute a disproportionate number of lefties of US Presidents. The average number of lefties worldwide is somewhere around 10% while 18.6% of US Presidents were left-handed. Another oddity is that none of the first 19 presidents were left-handed. This is probably because there was a stigma against being left-handed and children were forced to use their right hand.