CNN will report that the FBI has thus far found no evidence of criminal wrongdoing in the Hillary Clinton e-mail probe. That won’t slow Donald Trump’s march to the White House via the low road. The one aspect of Republican orthodoxy he has embraced is the relentless drumbeat on Benghazi and the e-mails that have driven up Clinton’s negatives. Why stop doing what clearly works so well? Trump will just be the latest in a long series of politicians cynically heeding Hitler’s doctrine of the big lie. Shame on those who do it. Shame on those who fall for it.