"His primary rules were: never allow the public to cool off; never admit a fault or wrong; never concede that there may be some good in your enemy; never leave room for alternatives; never accept blame; concentrate on one enemy at a time and blame him [or her] for everything that goes wrong; people will believe a big lie sooner than a little one; and if you repeat it frequently enough people will sooner or later believe it."
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(Answer:
Surprisingly, this was not written about anyone currently running for President of the United States who is known for repeating big lies. It comes from the Office of Strategic Services Psychological Profile of Adolf Hitler written by Walter C. Langer during WWII. And no, it's no longer too early to raise the spectre of domestic fascism in the case of a candidate using nothing but lies, xenophobia, racism, and a cult of personality to build his campaign.)