Liberals had nine years to decipher Mr. Trump’s appeal — and they failed. The Democrats are a party of college graduates, as the whole world understands by now, of Ph.D.s and genius-grant winners and the best consultants money can buy. Mr. Trump is a con man straight out of Mark Twain; he will say anything, promise anything, do nothing. But his movement baffled the party of education and innovation. Their most brilliant minds couldn’t figure him out.
