They know what will profit them, and they are very persistent. However it is only now that the process has reached any elected representatives of the public. But if we are to stop it, we must not look for excuses for inaction. Relying on the First Amendment is another excuse for inaction. It is good that many companies are on our side, but we cannot count on them to win this battle without us.
Defeatism is another excuse.
If you don't live in those states, pick a few friends who do and talk with them about the issue. Other than that, it is a good letter. In the mean time, sending it to your own state legistators, state attorney general, and governor can't hurt, no matter what state you live in. If so, tell us. Talking with a few people you know well in the US, to make them aware of the problem and encourage them to act, is useful.