Trump supporters are the bottom of the barrel
http://www.newsweek.com/who-are-trumps-supporters-hard-stats-373560
One half of his voters have a high school education or less compared to 19 percent with a college or post-graduate degree. Slightly over one third of his supporters earn less than $50,000 per year while 11 percent earn over $100,000 per year.
In regard to ideology, 20 percent of his supporters report that they are liberal or moderate, with 65 percent saying they are conservative and 13 percent labeling themselves as very conservative. His support from those saying they are involved with the tea party movement is 30 percent—meaning that 70 percent of his supporters are not involved with the tea party.
In sum, his supporters are a bit older, less educated and earn less than Republican averages in the YouGov sample.