In other words, in 2012, Republicans with a college degree or more preferred Romney over Obama by 14 percentage points. In 2016, Republicans with a college degree or more preferred Trump over Clinton by 4 percentage points.
Behind Trump’s victory: Divisions by race, gender, education. (Pew Research Center, 11/9/2016)
In the 2016 election, a wide gap in presidential preferences emerged between those with and without a college degree. College graduates backed Clinton by a 9-point margin (52%-43%), while those without a college degree backed Trump 52%-44%. This is by far the widest gap in support among college graduates and non-college graduates in exit polls dating back to 1980.