Why is it the more education a person has, the more likely he is to vote democrat?

Democratic Party has a 13-point advantage (55% vs. 42%) among those with a bachelor’s degree or more formal education. Since 2017, the gap in partisanship between college graduates and those without a degree has been wider than at any previous point in Pew Research Center surveys dating back to the 1990s.

About six-in-ten registered voters who have a postgraduate degree (61%) identify with or lean toward the Democratic Party, while 37% associate with the Republican Party. Voters with a bachelor’s degree but no graduate degree are more closely divided: 51% Democratic, 46% Republican.

Why is it the more education a person has, the more likely he is to vote democrat?
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