I believe the answer is:
attending school board meetings, as well as town or city hall meetings, joining your friends on the web, commenting about political situations,
volunteering your time at both Republican and Democratic events to learn about party platforms to make an informed decision
In order to be involved in the politic, you need to do some activities that would influence the outcome of legislation or programs that would be created by the government.
Attending city hall meeting could influence the outcome by directly give opinion and suggestion to local representative and volunteering in party's campaign help influence the outcome by giving support to the parties to obtain more influence in congressional seat.