On the interactive graph below, you can click on "associate," "bachelor's," and "graduate" to see each candidate's take from Voters of those educational achievement categories.

The second chart of this graph shows, from the districts each candidate won, how many of the voters were without any college degree. 

As you see in the first of the two charts above, Kasich does exceptionally better than the others with voters who have associate degrees. The same dark-horse Republican does well with other above-high school voters, too, but not nearly as well as the Democratic candidates do. Both Clinton and Sanders edge Kasich out in those categories, especially when it comes to post-grads. 

The second chart shows that Trump and Cruz are doing best in districts with voters who have low educational achievement.