I'm sure that all states have similar campaigns for students -- join, join, join if you can. Even if you're voting for the other guy, sign up for his campaign. I think it's about our involvement and knowing what's being said that is the most important, especially for the younger crowd. You may hate politics, that's fine, but have an open mind and open ears. Listen to the ideas and the thoughts being presented and form opinions. It's important!
Here's the link to New Hampshire's application, I'm sure you can find your state off this page.