One thing I overlooked in my previous post is to write letters to the editor of major newspapers in your state. (Or even minor newspapers, if they publish letters to the editor). Letters to the editor should be grammatically correct, concise, and to the point. Explain why a proposed (or recently-enacted) law is bad, what the negative consequences may be, and how the [proposed] law will negatively affect law-abiding citizens.
Not all newspapers publish letters that don't fit their agenda. Some do -- once in awhile. If your first letter doesn't get published, don't let that stop you from writing again when another issue comes up. Even if your letter doesn't get published, someone at the paper will read it. If a newspaper receives enough letters protesting a bad law or a bad proposal, it may eventually cause them to rethink their position.
I'm a member of a 2A advocacy group in my state. At monthly meetings I have often heard people advise the membership not to bother writing to [newspaper] because "they don't like us." The fact is, of four or five major newspapers in the state, [newspaper] happens to be the only one that is consistently conservative in editorial outlook, and favorable to the 2A. In the past couple of years I have written three pro-gun or pro-2A letters to the editor of [newspaper], and all three were published. I suspect the reason other people's letters weren't published (if they really wrote at all) is that their letters were poorly written and/or incoherent in making a point. A newspaper typically devotes half or a third of a page (or less) to letters to the editor, and they try to print at least three letters, on different topics, every day. You're probably not submitting a full op-ed column, you're writing a letter to the editor. It has to be short and make the point clearly, or it won't be printed. That's just the way it works.