Clintonian centrism is really unpalatable to the dem. electorate right now. The evidence of that is in the discussion itself - which is now being steered in a different direction which speak directly to the needs of the people.

Progressivism isn't merely populism (as some analysts tend to over-simplify its appeal) - it's also indicative of where humanity must go in order to actually progress (reversing climate change, cleaning up waters/food supply, neutralizing monopolized industries, halting elective, offensive wars, administering a more abundant distribution of resources to raise quality of life etc..)

There has been a very clear and accumulative energy building towards progressivism rising within the democratic party - and it's likely here to stay for 2020 and the foreseeable future. Hopefully, it can start to infuse a futurist republican party that reforms itself drastically - just as the democratic party is in the process of doing.