Have you found the beginning, then, that you are looking for the end?

politico |  If I asked you what most defines Donald Trump supporters, what would you say? They’re white? They’re poor? They’re uneducated?

You’d be wrong.

In fact, I’ve found a single statistically significant variable predicts whether a voter supports Trump—and it’s not race, income or education levels: It’s authoritarianism.

That’s right, Trump’s electoral strength—and his staying power—have been buoyed, above all, by Americans with authoritarian inclinations. And because of the prevalence of authoritarians in the American electorate, among Democrats as well as Republicans, it’s very possible that Trump’s fan base will continue to grow.

My finding is the result of a national poll I conducted in the last five days of December under the auspices of the University of Massachusetts, Amherst, sampling 1,800 registered voters across the country and the political spectrum. Running a standard statistical analysis, I found that education, income, gender, age, ideology and religiosity had no significant bearing on a Republican voter’s preferred candidate. Only two of the variables I looked at were statistically significant: authoritarianism, followed by fear of terrorism, though the former was far more significant than the latter.

Authoritarianism is not a new, untested concept in the American electorate. Since the rise of Nazi Germany, it has been one of the most widely studied ideas in social science. While its causes are still debated, the political behavior of authoritarians is not. Authoritarians obey. They rally to and follow strong leaders. And they respond aggressively to outsiders, especially when they feel threatened. From pledging to “make America great again” by building a wall on the border to promising to close mosques and ban Muslims from visiting the United States, Trump is playing directly to authoritarian inclinations.

Not all authoritarians are Republicans by any means; in national surveys since 1992, many authoritarians have also self-identified as independents and Democrats. And in the 2008 Democratic primary, the political scientist Marc Hetherington found that authoritarianism mattered more than income, ideology, gender, age and education in predicting whether voters preferred Hillary Clinton over Barack Obama. But Hetherington has also found, based on 14 years of polling, that authoritarians have steadily moved from the Democratic to the Republican Party over time. He hypothesizes that the trend began decades ago, as Democrats embraced civil rights, gay rights, employment protections and other political positions valuing freedom and equality. In my poll results, authoritarianism was not a statistically significant factor in the Democratic primary race, at least not so far, but it does appear to be playing an important role on the Republican side. Indeed, 49 percent of likely Republican primary voters I surveyed score in the top quarter of the authoritarian scale—more than twice as many as Democratic voters.

Political pollsters have missed this key component of Trump’s support because they simply don’t include questions about authoritarianism in their polls.