> There are rumbles about doing it (anti trust, supporting unions, climate change), but it never _quite_ seems to actually materialize into anything.

There's only so much they can do when dealing with obstructionism, but the party is still putting forward legislation. For recent examples see The American Homeownership Act (https://www.banking.senate.gov/newsroom/minority/senate-demo...) and the Stop Corporate Takeovers of Physicians Act (https://www.warren.senate.gov/newsroom/press-releases/warren...)