Having the two of them debate race and gender issues would show more clearly than anything else that one candidate has a record and vision to bring people together, and one has offered the most divisive, bigoted and sexist comments and policies we've seen from a major party nominee. Even in other times of social unrest, few if any presidential candidates have constructed their political arguments around themes of race, gender and cultural diversity as much as Clinton and Trump. [...] their message has only intensified before the first debate, which looms as a showdown for a wide spectrum of voters — minorities and women and more educated voters on one side, white men and working-class voters on the other. After the police shootings in Tulsa and Charlotte, Trump's running mate, Gov.