That said, Freud and William Bullitt wrote quite the fascinating psychoanalysis of Wilson: Thomas Woodrow Wilson which was distinctly unfavorable to Professor Wilson. Since I dislike Wilson intensely, I've always enjoyed it. Erik Ericson also did an interesting psychobiography of Luther: Young Man Luther that was very popular back in the '60s and '70s.
Freud and William Bullitt wrote quite the fascinating psychoanalysis of WilsonThe NY Times ran a "New Pyschology" explanation for T.R.'s 1912 run by Morton Prince, M.D. I'll post the .pdf of the article for a few days: "Roosevelt as analyzed by the new Pyschology" (Warning: pdf file!)
You'll get a kick out of it.
With today's large fields of candidates, it's always possible to find one real kook, and elect someone who also has something wrong upstairs. And of course the observers are biased themselves, and prefer some candidates to others.
"Presidential temperament" was a big theme in 1976. It doesn't look like the professional observers caught Jimmy Carter's own deficiencies and rigidities. They were comparing Carter to recent presidents Nixon and Johnson. Carter didn't have their particular flaws -- and they didn't want Ford to win -- so they judged Jimmy not just to be sane, but to have an untroubled psyche, and missed his obsessive nature.