Democratic Trump equivalent?

[pbrower2a]

One would need

(1) a plutocrat
(2) a demagogue
(3) with no experience in public office but seeming to know everything
(4) willing to contradict himself between campaign stops
(5) having a proclivity for advocating violence against opponents

The core constituencies of the Democratic Party, middle-class ethnic, religious, and sexual minorities, government employees, and middle-class feminists, would never fall for such. Poor blacks respect middle-class blacks and poor Hispanics respect middle-class Hispanics as poor whites do not respect middle-class whites.  The black, Hispanic, and Asian middle classes are very rational in their politics. These are learned people as a rule, and learned people eschew demagogues for the unreliability of demagogues. 

Donald Trump represents a breakdown in the Republican Establishment. It is paradoxical that Hillary Clinton is much closer to the sane foreign policy of the elder Bush than is Donald Trump.

...When the white middle class starts recognizing that it has more in common with the black middle class, then the game is up for the Tea Party Right.

[pbrower2a]

The phenomenon was first experimentally observed in a series of experiments by David Dunning and Justin Kruger of the department of psychology at Cornell University in 1999.[1][2] The study was inspired by the case of McArthur Wheeler, a man who robbed two banks after covering his face with lemon juice in the mistaken belief that, because lemon juice is usable as invisible ink, it would prevent his face from being recorded on surveillance cameras.[3] The authors noted that earlier studies suggested that ignorance of standards of performance lies behind a great deal of incorrect self-assessment of competence.

This pattern of over-estimating competence was seen in studies of skills as diverse as reading comprehension, practicing medicine, operating a motor vehicle, and playing games such as chess or tennis. Dunning and Kruger proposed that, for a given skill, incompetent people will:[4]

    fail to recognize their own lack of skill
    fail to recognize the extent of their inadequacy
    fail to accurately gauge skill in others
    recognize and acknowledge their own lack of skill only after they are exposed to training for that skill

Dunning has since drawn an analogy – "the anosognosia of everyday life"[5][6] – with a condition in which a person who experiences a physical disability because of brain injury seems unaware of, or denies the existence of, the disability, even for dramatic impairments such as blindness or paralysis: "If you're incompetent, you can’t know you’re incompetent.… [T]he skills you need to produce a right answer are exactly the skills you need to recognize what a right answer is."[5]

https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect

[pbrower2a]

It would take the sorts of voters who went from Bill Clinton to George W. Bush, and in turn Donald Trump to abandon a Republican Party that it sees as elitist and unresponsive to their values to turn to a Donald Trump-like figure when the Democrats are in trouble winning national elections. Such would require an inversion of the Parties.

Inversion of the Parties? Such has happened. Just contrast elections involving Eisenhower to those involving Obama.