I often notice left-handedness, perhaps because I am a left-hander. A few days ago, while watching a video of the most recent Hillary Clinton-Barack Obama debate, I noticed that Barack Obama was left-handed (he was taking notes with his left hand). That video reminded me that Bill Clinton was also a leftie.
After reading this ABC News article [1], I was reminded that Gerald Ford, Ronald Reagan and George H.W. Bush were also left-handed (George W. Bush is right-handed). The same article indicates that John McCain is also left-handed. So is John Edwards.
Pretty startling statistic, given the fact that only about 10% of people are left handed. The ABC News article suggests an explanation:
Scientists and historians agree that being left-handed, which is often associated with outside-the-box thinking, can be a political strength.
[2]