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Attend marches and rallies.
You aren't powerless, but you have to exercise your power whether it's on the winning side or not. All battles in a democracy are losing battles until they aren't, but the tables don't turn unless people join.
It really doesn't seem like there is anything you can do. Sure you can talk to your representative, but why are they going to bother dealing with something that such a small margin of their voters care about?
