Since the thread is already godwinned, let me put in my two cents.
This is called the
Big Lie, a propaganda technique devised by Hitler and Goebbels. The Republicans have been shouting that the Clintons are evil for the last 25 years, and have been initiating all kinds of investigations after every little detail of their lives.
And all they found was a stain on a dress.
But the continuous shouting they're evil and bad results in that even people who would be sympathetic to their policies have come to believe it.