It is my belief that, if you care at all about the state of the world we live in, it is your duty as a citizen to let your elected officials - at all levels of government - know where you stand on the issues of the day. Voting is not enough.
Furthermore, it's important to do more than just send email. It's entirely too easy to send - or to fabricate - email, and, for better or worse, Congress by-and-large ignores email. You need to call or write a letter. Your comments need not be long or particularly eloquent, but they should be your own, and should be specific.
I'm calling to ask that Senator Backscratch support Senate Bill S.666, a bill that will institute reforms in the licensing and operation of subterranean diabolical internment facilities.
You'll probably be asked your name and (at least) your zip code; the office will want to know if you are a constituent. Note that, because of the congressional committee structure, it's often helpful to contact senators and congresscritters outside your district.
Dear Representative Graft:
To locate the names, addresses and phone numbers of your Congressional representatives:
If you want to get even more involved with Congress, you might consider directly lobbying your representatives. This sounds mysterious, but it's not. Amnesty International offers a brief guide to lobbying that describes the process and the steps you can take to be successful.
Massachusetts residents can get state level information at the Massachusetts Elections Division web site.