Great idea but a few things...wouldn't take Wells. The Clinton clue makes no sense and the Rolling Stone's greatest guitarist...I only thought of the band, not the magazine. I typed Hendrix even before I read every clue simply because I knew he'd be an answer and it wasn't accepted.
Impeachment means brought up on charges, not removed from office. Andrew Johnson was impeached by the House, but narrowly avoided removal from office. Same for Clinton, except not as narrowly. Nixon avoided impeachment and removal by resigning before the House could vote on the articles of impeachment.
I'm not sure if Napoleon was left-handed. I've never heard that before. I've heard that Hitler was, but I know that's not true. You can see him signing autographs in old films, and he's right-handed.
The List of people who are left-handed on Wikipedia doesn't include Alexander the Great or Charlemagne. It also doesn't include Fidel Castro, but does include his son, Fidel Castro Diaz-Balart.
Bart Simpson is also left handed.