Of course that can lead the USA to try and regulate the content of DNS servers to restrict access to offshore networks.
McCain & Co might find a lot of support in the UN for internet regulation.
China and Yahoo. France vs Google. A building body of successful censorship.
I question your idea. I believe the laws apply to any computer in the US. If offshore servers are targeting US PCs and conducting illegal campaign activities (formerly known as "free speech") that way, access to those servers would be blocked or international action taken.
We win the fight here, in the US.
Or start learning to live without freedom.
If we can't put up at least some kind of fight on this, we just don't deserve to be free, really. And I don't think it will take much of a fight ot win this.