In case you ever thought writing, calling, or emailing your representatives was a waste of time, take it from Steve Hildebrand, Barack Obama's openly gay deputy national campaign director: "I don't think our voices are as powerful as they should be. I think too many people in the gay community do not push their elected officials as hard as they should. If you had 20 gay people together in a room and asked how many of them actually have reached out and either called, e-mailed or sent a letter to their member of Congress over the last two months, I would say the vast, vast majority of them will have done nothing. My suggestion is that people need to become strong activists, that we need to multiply by hundreds the number of activists we have in the gay community. We need more voices, we need louder voices, and we need to tell politicians at every level we're not willing to take their excuses anymore."
And in case you needed reason not to write, call, or email your representative: You will almost never be able to get her on the line. An office staffer will answer the phone (or sometimes just a voicemail box), sort the letters, and go through emails, responding with a form reply, if anything.
What those staffers will hand your legislator, likely, is a tally of how many notes and calls they received from X number of constituents on Y different issues. That summation, however, is what's powerful. In a legislator's very busy day, these briefs are easy to digest and send the most black-and-white picture of what his voters believe.
So yes, your letters and phone calls matter. In aggregate. JUST LIKE VOTES!
This is why I think its so important we write letters and mail them (skip the email - print out your email if you mist and mail it in).