I find it helpful to understand the emotions Trump elicits, and channels, at his rallies. I assume his rally goers are among the most fervent of his supporters, so I'd just as soon take as close a look as possible at that core of his core. Assuming he's a candidate again in 2020, though a lot can happen between now and then.
Written before the midterms, these are perspectives offered by Trump rally attendees. Good stuff...
https://www.theguardian.com/us-news/2018/nov/01/trump-rallies-america-midterms-white-house
"There is no understanding Donald Trump without understanding his rallies.
They are the crucible of the Trump revolution, the laboratory where he turns his alternative reality into a potion to be sold to his followers. It is at his rallies that his radical reimagining of the US constitution takes shape: not “We the people”, but “We
my people”...
..Five rallies, eight days. At each, we explore a different emotion that Trump evokes to arouse his people’s devotion, in search of the source of his appeal."