Spot on. Bernie's rise in 2016 was partly in response to that . The actual left is powerless despite the response Bernie got in both his runs without large contributions.
Joe Biden is very much in the centre at best, given the new focus on trying to woo republican voters the party is shifting to the right.
Unfortunately the Obama era (or maybe the coming Biden gov't) reminds me of another prominent historical liberal/social democratic gov't that came to power in a declining but powerful imperialist country with huge promises of ending war, resolving social and economic injustices, etc. but then governed weakly with poor compromises and bad leadership...
That gov't I'm thinking of would be the Weimar Republic.
Joe Biden is very much in the centre at best, given the new focus on trying to woo republican voters the party is shifting to the right.