Just Vote!
Dave Johnson makes an important point – if you don’t vote you are invisible to politicians.
A good example of this is the way that young people just got mugged by Congress over the interest on student loans. They wouldn’t have dared to screw over people like that if they voted.
Seniors have a lot of power. The reason they have the power is because they always vote, and politicians know that if they mess with issues that are important to seniors they are going to have trouble in the next election.
There really are enough young people to form an important voting bloc if they would just vote at least in every Federal election, although they really should vote in every election to solidify their power.
If you don’t like the major candidates, vote for minor party candidates. You can usually vote for whoever is opposing the incumbent if you don’t think your wishes are being addressed. The important thing is to have the fact that you vote registered. You don’t have to donate to candidates or canvas, or even join a political party, but you have to make the politicians aware that you exist, and you intend to vote for your own interests.