The Republicans have been demonizing all Democrats with a shot at the presidency.
Yeah, and Democrats have been demonizing Republicans... think is, Republican's have been much more far-sighted and effective in their demonization efforts*. That's largely the Dems' fault - the Rep's could see Hillary coming from miles away, and so had decades of practice demonizing her, but they nominated her anyway. Dems never took Cheato seriously until the day after the election.
I hope there is a crowded field of Dem Presidential candidates in 2020, so at least the Russo-Republican demonization machine will have to spread its efforts out somewhat.
* Pizzagate - - a great example of demonization. Only credible to card-carrying trumpsuckers, but they genuinely believed it, to the point where one of them shot up the restaurant.... Maybe this time around there will be
"Trump sells kidnapped babies to sex trafficking ring and meat processors" stories?