Donald Trump is like a contagion who infects everyone around him. Once you've kissed, you can never wipe his saliva off your face. Consider the venerable (in its own view) NBC. This year, the network fired Trump, only to find it is Trump Lite. On June 16, when Trump was announcing his candidacy for the White House, the billionaire reality-TV star faulted Mexico for sending problem people to the United States. Quoth Trump: "They're bringing drugs. They're bringing crime. They're rapists." Those comments were stupid and racist -- and they should have caused Trump to tank in the polls and...