I think we’re mainly talking about a change in labeling.
At any point 10 years ago, or 20 years ago, or 30, or 40, you could have asked Democrats if they preferred a system largely driven by state command-and-control, or by the free market, and they would have told you they preferred the former. They’ve always trusted the political class more than the business class, and they’ve always thought unfettered capitalism was inherently unjust and needed to be reined in by politicians.