Why does Obama write with a backhand?

For hundreds of years, the president of the United States has become more and more "left"-not a policy, but a habit of being left-handed. Barack? Obama is the latest member to join the left-handed club since the 20th century. James. Garfield, Herbert? Hoover, Henry? Truman and Gerald? Ford, Ronald? Reagan, George? h？ W? Both Bush and Bill Clinton are left-handed.