The political system in the US is so rotten & corrupt that voting is largely a waste of time anyway. The system is awash in lobbysists, special interest groups, wealthy donors etc pushing money to both parties. Most of the politicians are in DC to make a career of it or to get a high paying job from it afterwards. A lot of voters don't even care about the person they voter for, just that the person is in the right party & there are only two parties to choose from. It's all bullshit theater with obscene amounts of money swapping hands. If you are going to bother voting at all then basing it on an single issue that is important to you is certainly better than voting for the same party every election no matter what which is what most people in this country do.
Discussion
Vires In Numeris.
If you want it to change, you have to be willing to make the change towards it.
It might feel useless, but - Vires In Numbers.
My point is that the system itself is too corrupt. There are certainly well-meaning politicians in office but the power is in the system of the two parties who have a lock on power. The system allows for lobbyists, special interest groups, corporations, the mega rich to influence & push for regulations/laws that favor them. The system is working for them & although well meaning politicians exist they are working inside that system & they are powerless to change it. For any true meaningful change to occur it will require an absolute overhaul of the entire political system, that is to completely get rid of all the money coming in from those groups, to allow for more than two political parties etc & that cannot ever come about from voting for low level well-meaning politicians. Those with the real power, the ones who don't need to be elected are never going to allow this system to change. It would take something akin to a revolution to have that happen.