One-hundred-seventy days are several lifetimes in politics, especially in presidential-election years. That's how many days remain before voters go to the polls in November. Already the race looks very different than it did just a couple of weeks ago. The twists and turns of the rest of the campaign trail are as difficult to predict as what's already occurred this year. One thing that's coming into sharper focus is that the best thing Donald Trump has going for him is Hillary Clinton. Team Clinton chortled over the possibility of a Trump candidacy. Their internal polls showed her breezing by a...