According to a national survey of 1,800 registered voters, the variable that best predicted support for Donald Trump was authoritarianism. The idea that highly authoritarian individuals tend to be highly obedient and gravitate toward strong or charismatic leaders is nothing new, as the author duly notes. In the context of the current electoral season, though, it should give us something to consider as the first caucuses and primaries are to be held within a matter of weeks. The author suggests that pollsters may be incorrect in assuming that Trump has a ceiling of support within the Republican Party that he has already reached. Rather, the author of the study suggests that there is the distinct possibility that Trump will fare better than pundits have predicted (including one whom I tremendously respect, Nate Silver, of 538 blog).
The only other variable that the author claims was statistically significant was fear of terrorism, which seemed to indicate support for Trump. Other variables, such as income level, race, etc., did not serve as significant predictors, according to the author. The author's narrative does seem to fit with some data I published last year that showed a significant positive link between authoritarianism and racial/ethnic resentment, social conservatism, and intolerance, which may well be what characterize the attitudes of Trump's base of supporters.
Some skepticism is always in order. There has been some question about how much of the variability authoritarianism actually predicts, with some scholars suggesting that other variables, such as social dominance orientation are better predictors of political attitudes and behavior than authoritarianism.
The researcher behind the survey, Matthew MacWilliams, is a doctoral candidate at University of Massachusetts. His research was conducted very recently and as of yet has not gone through the usual vetting process that academic research normally undergoes. I am guessing or at least hoping that other social scientists will have the opportunity to examine the data as well, and that MacWilliams has the opportunity to present his findings in venues other than a political blog. The results are interesting, nonetheless.