D/R is just Coke vs Pepsi. It doesnt matter if you vote D. You are just voting cattle, and they will in case of majorities conjure up a parlamentarian, a Liberman/Manchin/Sinema figure or a conservatibe supreme court as excuses for doing nothing for you. Your progressive candidates will be in favor of all things good when they have no chance of passing, but when push comes to shove, enough of them will vote present on key votes to keep things from passing. See Squad on Israel, arms deals and police funding.
Your corporate masters want to restrict you to arguing about inconsequential issues to them, like genders, gay rights, abortion and guns.
You will get nothing from the rigged political game, and your prearranged demonstrations at permitted and restricted venues will get you nothing.