First off welcome!
Well first you'd have to get 18 posts and register to vote(as JFK has already pointed out).
Then if you want to run for something I believe the next election you can run in is for Hughento's senate seat coming up this June. After that TexasGurl's seat is up in August I believe and perhaps IlikeVerin's Gubernatorial seat.
Of course you could always run for President though I don't think an Independent 3rd party would do too well....
Anyway if you want to run for any of these offices just start a thread announceing your candidacy.
Hope this helps