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.
No, Democrats are perfectly reasonable. They just buy indulgences for their white guilt through "fair trade" coffee or what have you. Don't forget the entire bogus vitamin/nutrition/vague mysticism industry that is sustained only by the liberal base of the Democratic Party.