What even can they do?

• Refuse Democratic cooperation on a single Republican nominee or bill without severe concessions.
• Hang any Democrat who dares utter the word "bipartisanship" from a lamp post.
• Boycott important Trump speeches.
• Refuse to assist in passing laws that will give the president more power.
• Filibuster everything and use every iota of resistance in the Senate possible.
• Participate in direct protests like Al Green - every single member should have done the same thing.
• Participate and lead street protests directly.
• Demand lawful access to government buildings, enter by force if necessary.
• Have candidates for 2028 start running for president NOW, to serve as foci and centers of resistance.
• Start drafting a "Project 2029" now. Be just as prepared as Trump's team was.

They are not doing any of these things.