Expanding the number of supreme court seats to ensure a DNC-aligned majority. Fillibusters. Executive orders. Gerrymandering. Giving state rights to left-leaning territories and split states to create extra DNC-aligned senate seats. Attack ads. Restrict campaign funding for major donors so Republicans have less propaganda funding than Democrats do. Give migrants citizenship so they vote Democrat.

Basically, use every trick they can get away with to push the Democrat agenda through and to increase the chances of Democrats winning future elections.