As we saw in the Republican Party, two establishment v. base fights(McCain v. Huckabee, Paul; Romney v. Santorum, Gingrich, Paul) lead to the rise of someone despised by both the establishment and the base. I suspect the Democrats may have their own Trump arise. Maybe Roseanne Barr?
You are operating under the faulty assumption that Democrats are as psychologically malleable as Republicans. I have yet to see evidence that Democrats fall for gold coin scams and other snake oil at the same rate as Republicans.