It seems as if people with one variant of the MAOA gene are more likely to vote than those with the other version. Among regular churchgoers, those with one type of the gene that make the 5HTT transporter molecule in the walls of neuron cells (don't ask) are substantially more likely to vote than those with the other.
According to the researchers, James H. Fowler and Christopher T. Dawes, it works more or less like this: stress causes the release of excess serotonin in the brain, which can kill off neurons if it is not metabolized. People with the right versions of the MAOA gene and 5HTT are better at handling stress because they are better at synthesizing the molecules needed to reabsorb serotonin and break it down. And people who are better at handling stress deal better with the conflicts and strains inherent in forming political opinions and voting.
Similarly, folks with the A2 version of the D2 dopamine receptor gene are more likely to identify as partisans because better dopamine signaling in the brain is related to more social attitudes and promotes attachment to groups like political parties.
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