“He is strongest among Republicans who are less affluent, less educated and less likely to turn out to vote. His very best voters are self-identified Republicans who nonetheless are registered as Democrats. It’s a coalition that’s concentrated in the South, Appalachia and the industrial North, according to data provided to The Upshot by Civis Analytics, a Democratic data firm.” (NYT)

Then there’s this take on it – “One way to understand Trump’s longevity is to look more closely at his supporters. Trump’s backers tend to be whiter, slightly older and less educated than the average Republican voter. But perhaps more importantly, his supporters have shown signs of being misinformed. Political science research has shown that the behavior of misinformed citizens is different from those who are uninformed, and this difference may explain Trump’s unusual staying power.” (538 Politics)