Many biological traits follow a so-called “normal distribution” (a.k.a. “bell curve”) across populations, and to the extent that intelligence follows this pattern, then half of all human beings have above average intelligence, and the other half below average intelligence.
Might this explain something significant about the roughly 50-50 split being revealed between Biden supporters and Trump supporters?
Now, to the extent that this coincidence is truly meaningful (quite plausibly not at all, but still), and although I do have my own intuitions regarding which half of the intelligence bell-curve might correspond to Biden- and which half to Trump supporters, unfortunately there’s really nothing about the mere coincidence itself that indicates whether I’m right or wrong in that regard.
So, really, both sides are free to flatter themselves with this observation, and thereby achieve a cozy and consoling sense of smugness and superiority.
Hope that’s useful!