Amanda Taub in Vox:
The American media, over the past year, has been trying to work out something of a mystery: Why is the Republican electorate supporting a far-right, orange-toned populist with no real political experience, who espouses extreme and often bizarre views? How has Donald Trump, seemingly out of nowhere, suddenly become so popular?
What's made Trump's rise even more puzzling is that his support seems to cross demographic lines — education, income, age, even religiosity — that usually demarcate candidates. And whereas most Republican candidates might draw strong support from just one segment of the party base, such as Southern evangelicals or coastal moderates, Trump currently does surprisingly well from the Gulf Coast of Florida to the towns of upstate New York, and he won a resounding victory in the Nevada caucuses.
Perhaps strangest of all, it wasn't just Trump but his supporters who seemed to have come out of nowhere, suddenly expressing, in large numbers, ideas far more extreme than anything that has risen to such popularity in recent memory. In South Carolina, a CBS News exit poll found that 75 percent of Republican voters supported banning Muslims from the United States. A PPP poll found that a third of Trump voters support banning gays and lesbians from the country. Twenty percent said Lincoln shouldn't have freed the slaves.
Last September, a PhD student at the University of Massachusetts Amherst named Matthew MacWilliams realized that his dissertation research might hold the answer to not just one but all three of these mysteries.