It is very easy to get a foot into the door of most political parties. Remember this quote when hesitating:
One of the penalties of refusing to participate in politics is, that you end up being governed by your inferiors – Plato
Pain is temporary. It may last a minute, or an hour, or a day, or a year, but eventually it will subside and something else will take its place. If I quit, however, it lasts forever.