Trump actually won whites who earned only a bachelor’s degree by a fairly wide margin. Just as big a gap was between the votes of those who graduated from college and those who went to graduate school. The latter group supported Clinton in much larger numbers.
Actually, for whites, College Graduate Trump margin is 14%, for some grad school (i.e any at all) Clinton margin is 13%.
Now losing a group is not a problem, if you get other groups, unless the group you lose is already big, and getting bigger faster. This from the Census Bureau, back in 2014, as of 2013 (data including all races):
The number of people with some graduate education now exceeds the number who have just a bachelor’s degree –36 million to 30 million, one of the interesting findings in the newly released 2013 educational attainment table package.
An interesting aspect of the increase in education has been the rising tendency of people with a bachelor’s degree to return to school and get more education. The number of adults who have completed some graduate school increased 24 percent from 2008 to 2013, from 29 million to 36 million. That is to say, 7 million more people have experienced at least some graduate school education than was the case five years ago. As you can see, going to graduate school for additional education beyond a college degree has become the majority experience for those with a bachelor’s degree. (Bold added.)
That is good news for lots of reasons, not least in its long term voting projection implications.