Contacting Your Legislators
You can find your legislators here.
Writing to or calling Legislators
It's hard to overestimate the value of writing to or calling your state legislators, both representatives and senators. You can email them, send them a hand-written letter, or pick up the phone. You can comment on pending bills they are debating, or just raise an issue and tell them your view.
Unlike editors, these are elected officials. They really want to know what you think. Why not tell them? Some of your legislators will agree with you and some won't. If you want to really get their ear, though, the smart way is to be clear, concise, and respectful.
Legislators will almost always reply to your communication, so you can reply to them and eventually they will get to know you. It's a relationship worth developing.