"He has talked about white supremacists as fine people," says Democratic presidential candidate Elizabeth Warren. "He’s done everything he can to stir up racial conflict and hatred in this country." Fellow presidential candidate Robert "Beto" O'Rourke agrees, saying Donald Trump himself is a white supremacist, which Merriam-Webster defines as "a person who believes that the white race is inherently superior to other races and that white people should have control over people of other races." Such an extreme claim about a president of the United States has no precedent in modern history. Yet Sen. Bernie Sanders agrees Trump is a...