Reproductive Strategies and Political Ideology

Key Insight

Political ideologies are deeply connected to contrasting kinship and reproductive patterns, specifically endogamy (marrying within the group) and exogamy (marrying outside). Richard Nixon's private statements, for example, reveal an anti-abortion stance but with exceptions for mixed-race fetuses or rape, alongside numerous anti-Semitic remarks. His ethnocentrism likely reduced his chance of reproducing with out-groups and increased the probability of marrying within his own group, marrying a Methodist like his father.

This pattern reflects a broader trend: the Pew Research Center found that Republicans are nearly twice as likely as Democrats to consider interracial marriage 'a bad thing for society'. Liberals and conservatives, with their differing levels of tribalism, distinctly approach the transmission of DNA. Cultural practices like hairstyles, dress, languages, and laws act as symbolic 'pseudo-speciation', exaggerating in-group/out-group differences to promote endogamy. More conservative individuals are more likely to wear and enforce these ethnic markers.

International studies reinforce this link. Jos Meloen found a strong correlation (0.74) between a cultural preference for endogamy and countries with right-wing authoritarian governments. These countries often have weaker incest taboos allowing cousin marriage and parent-arranged marriages. Conversely, more liberal countries tend to have stricter incest taboos, greater individual freedom in partner selection, and higher rates of exogamy, leading to reproduction between more distantly related individuals.