Republicans across the country are swallowing hard and wondering what Donald Trump is going to be like as their presidential candidate—as if the answers are not clear enough. Americans who have been paying attention already know more than enough about Trump, even if he has a showman’s gift to endlessly keep stunning and provoking. That is why two-thirds of Americans not only tell pollsters they not only strongly disappove of him, but many are scared of him. Hillary Clinton’s negatives are high, but not like that.