Mark Vancleave/Star Tribune via AP Minnesota Representative Ilhan Omar, center, celebrates with her supporters after her Congressional Fifth District primary victory in Minneapolis. democracy_rules.jpg P resident Donald Trump has gotten extraordinary political mileage out of stoking the fears and prejudices of the predominantly white male voters who form the core of his supporters. Now the question is whether the progressive coalition at the heart of the Democratic base—including African Americans, immigrants, young voters, and women—can turn out in sufficient numbers on Election Day to reassert that most Americans value inclusion over hate, facts over lies, equity over greed, and government accountability over corruption. Too often, when talk turns to this “Rainbow Coalition,” a term first coined Chicago Black Panther leader Fred Hampton and later taken up by civil rights leader Jesse Jackson, progressive strategists wring their hands over the supposed pitfalls of “identity politics...