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.