The story says that post-convention, Clinton actually gained among white college grads, while Trump made big gains among white non-college grads:
Maybe non-college white people were watching the
Roman circus spectacle, and others were watching something else.
The question: will the non-college whites vote heavily in November?
College-educated whites vote, and they are more likely to change the minds of white people with no college degree to not vote for Trump than non-college-educated people are likely to convince college-educated whites to vote for Trump. College-educated people are generally much more capable of persuading people than are those who did not attend college.
