Both candidates are left-handed; left-handedness is far more common among Presidential politics than the general public. Andrew Gelman and I taught a seminar on left-handedness. We did two surveys that found that lefthanders tend to have left-handed friends more than righthanders.
The more older brothers a man has, the greater the likelihood that he will be gay; if a man has 10 older brothers there is a 50% chance. This is tied to hormonal effects in the womb apparently. But what’s interesting, the effect does not occur if the man is left handed, which rules out any socially learned explanation, i.e., older brothers “initiate” boys into same sex behavior. Marc Breedlove is my source on these matters:
https://www.msu.edu/~breedsm/research.htm#4
I’d be curious if anyone knows what’s been found about left-handedness and personality in general.
Interesting survey result. I am left handed but only have two friends who are left handed.