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I have no problems with so called "progressives" being a part of the Democratic Party. It is a very large umbrella. My issue with any faction is that they don't always get on-board with the majority. The obvious case in point are those Bernie supporters who crossed over to vote for Trump in the 2016 election because they could not stand Hillary. Many also voted for Jill Stein, the Green Party candidate.
Rather than just stereotyping all "progressives" as seemingly having one agenda, that group itself is rather broad. Joe Biden calls himself a progressive as does most all the Democratic candidates.
A better description for the Bernie faction is "socialists". In fact that's what Bernie at one time called himself: a socialist. Now he adds the word "Democratic" on front of Socialist for more respectability. Back in the 1970s, Sanders was the chairman of the Liberty Union Party, a Vermont offshoot of the socialist People’s Party. His worldviews have not changed one iota from the time he spent in an Israeli Kibbutz (commune) in his 20s. Then he was known as "Bernard". He is the same Bernie with the same socialist agenda. He has not changed. He cannot change. But Democrats need to work on educating his avid socialist supporters on why another Trump term would be far worse than a centrist Democrat as president.
On the other hand, the Republican Party seems to be able to embrace an unholy alliance of far right Christian evangelicals, Mormons, super rich oligarchs, corporate CEOs, gun nuts, military veterans, enlisted military men (but not the brass), non-union blue collar workers, and uneducated poor white men. How is that?
Much of it is in the messaging. Trump and Republicans know how to appeal to their emotions...not their intellect. That's why military officers have a much lower approval of Trump than then enlisted service members. Their jobs require strategic critical thinking.
Anyway, for Trump supporters, it doesn't seem to matter what he does to enrich himself at the expense of the taxpayer. They are indoctrinated.