The Human Trafficking Prevention Act is a piece of model legislation that is currently being advanced in several states. It would set up an opt-in filter for obscene content on the internet. The definitions for pornography in the USA are vague enough that such a law could easily be abused.
The following is an excerpt from the FAQ on their website (http://humantraffickingpreventionact.com/
"Furthermore, the total prohibition against any form of government regulation is completely unrealistic and would create a state of nature. Consider this: a fish on the grass is not free. It is only when the fish is confined to water that it can swim lightening fast, thrive, and even breath. The same is true with humans. Mankind does not flourish best when child pornography,prostitution hubs, and obscenity are all one click away or unavoidable. Without “truth,” there is no “freedom.” “Freedom” comes from the “truth.” “Freedom” is not the “presence of restrictions” nor the “absence of restrictions.” “Freedom” is the presence of the “right restrictions,” the set of restrictions that objectively fits the givenness of our nature, the truth about “the way we are,” and the truth about “the way things are.” The set of restrictions that promote the most amount of peace, intimacy, reconciliation, healing, and forgiveness, in order to advance human flourishing to the maximized capacity are the set of restrictions that the state and federal legislature should adopt."
The authors of the model legislation are playing a bizarre sophistic game where they define freedom to mean "whatever we think is best for you." If that isn't enough to get you worked up enough to call your state representative, I don't know what is.