I’ve read Cialdini’s work.
Trump has too... he’s a master of social proof and other tactics that in my opinion can be used for evil or good.
I think there is a limit to the effect. If one is starting from Neutral persuasion is essential in negotiation. Especially rational persuasion. Starting at Hillary ain’t neutral. Smearing Trump down to Hillary has not worked. Lying polls that say it has does not help. This kind of persuasion becomes snake oil salesman at this level. Contempt is the only effect selling snake oil generate. People may still have a little respect for the snake but no sympathy at all for the salesman.