Yep, they're trying to get rid of the provision that says ISPs/forums/etc. can't be held responsible for content their users post. If successful, they intend to... hold ISPs/forums/etc. responsible for content their users post.

This would be bad. People who operate ISPs/forums/etc. should oppose this attempt to change the law.

In particular, the Attorneys General are trying to shut down backpage.com (craigslist competitor) because some people use it to post smutty ads. But if the change they suggest were to be made, it would be open season to enforce any state law via attacks on the online services that people use.