If John McCain or Barack Obama get elected, it’ll mark the sixth time in eight elections that Americans have elected a left-handed president. Ronald Reagan, according to his son Michael Reagan, was originally left-handed but was forcibly converted to right-handed ways; George H.W. Bush is left-handed (although he golfs right-handed); Bill Clinton is left-handed (ditto on his golfing ways).
I have heard that Al Gore is left-handed, but I haven’t gotten this corroborated. I do know that Hillary Clinton is a right-hander.