Having forced myself to listen to most of the Republican National Convention (RNC) orations in late August, I was struck by what my daughter, who had done such work professionally, characterized as the program’s “underlying marketing strategy.” The GOP’s advisers seem to have pitched their message at the demographics among whom Trump has had the least support in the polls, namely suburban, college-educated women, and blacks. Trump, according to the polls, was losing the former group until recently by about 20 percentage points, and may be winning the votes of no more than 8 percent of blacks. The overall size...