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one would be hard pressed to pick two candidates who are greater polar political opposites than Trump vs Sanders
They
are polar opposites.
That is why Bernie would be a good counter to Trump.
One is a left wing populist and the other a right wing populist.
Trump is not pro-business.
Pro-business would mean he would encourage profits over people.
He wants tariffs instead.
Which will make everything expensive for the manufacturer and the consumer.
He is a protectionist.
So he is not an economic genius either.
Bernie proposes more public spending (particularly healthcare) and taxation of corporations.
I support that, but beyond a line it may also not be economically sound to do so.
So the similarity is that both of their messaging is for the working class and the middle class.
Both reject the elites and challenge the establishment.
That messaging will resonate.
That is certainly more substantive than the vapid and performative messaging that the Dems currently resort to.
This is not a rejection of the left as you put it.
Going by that rule 2020 was a rejection of the right. (No I dont believe in the coo coo for coco puffs election fraud conspiracy theory. Biden won fair and square).
This has more to do with messaging that directly addresses the economy and everyday problems people face.
The democrats currently are disconnected from this.