All resigning does is give them a greater margin to win votes by. We have several chances to win a tie or majority in the house and senate

Three house seats are up for special elections, two in florida and one in NY. If they all elect democrats, there will be a tie in the houde and any bill can be blocked.

Senate votes can be held without all members present, so making sure all democrat congress members always show up and always vote gives a good chance of blocking some bills

Also in 2026 will be the midterm and we can vote republican congressmembers out, as they only have a majority and not a supermajority.