As if Donald Trump’s presence in the looming presidential campaign wasn’t spooky enough, the past few months have been filled with haunting revelations about the people vying to lead our country. There is Kristi Noem, the South Dakota governor who is rapidly losing her shot at being Trump’s running mate because she can’t stop talking about killing her dog. And then there is Robert F. Kennedy, Jr., the man who hates vaccines but loves push-ups — and, according to the New York Times...