Food for thought (to go along with my 2010 post Psychology of Presidential Ambition):

"Overall, the study found, presidents tended to be more like psychopaths than the general population in their level of fearless dominance, but they didn't show a psychopathic excess of impulsive antisocial behavior."

"[B]old leadership isn't just a quality found in psychopaths — or presidents. Everyone falls somewhere along the scale, from timid to bold, from follower to leader. And psychopathic traits like fearless dominance — or others like impulsivity, callousness and dishonesty — also appear in varying degrees in the general population."

"Shadings of potential pathology are found in everyone."

Source: The Psychopathic Trait Successful Presidents Have in Common

(by Maia Szalavitz, TIME.com)