Voters as a whole are more educated than society, but the least educated group of voters, according to the study, are the "disadvantaged democrats".
From your own link;
Liberals were the most educated group with 49% being college graduates compared to an average of 26.5% among all the conservative groups (including the Democratic voting Conservative Democrats).
Of course, the fact that the link refers to conservatives as enterpisers has no bearing on the accuracy of the data.