Let's take a step back from the news of the past few days and ask a fundamental question: Why does everything suddenly seem different? Donald Trump, the unsinkable candidate who seemed immune to political consequences while winning Republican presidential primaries month after month, now finds himself with an ailing campaign and a bad case of personal toxicity. Cable TV and other news media are obsessed with fallout within Team Trump and dissension in the Republican Party. When Trump holds a rally or takes to Twitter, half the nation seems to hold its breath - waiting for him to insult someone,...