When we step back and look at American politics generally, genes may help us understand why, for countless decades, about 40 percent of all voters have supported conservative causes, about 40 percent have backed liberal ones, and the 20 percent in the middle have decided the elections. On a few occasions, the winning presidential candidate has won about 60 percent of the vote. But these days we call a 55 percent victory a “landslide.” It is hard to imagine a purely environmental force that would rule out a presidential election in which one candidate got 80 percent of the vote and his rival only 20 percent. Something deeper must be going on.
The biological is political
Our genes determine the color of our eyes, hair type and the frequency we vote.
