The advantage of federalism is that individual states can go their own way. This is the idea behind the Free State Project -
http://www.freestateproject.org/ - which has a goal of relocating 20,000 activists for individual liberty and limited government to the state of New Hampshire in order to protect and expand individual liberty.
We've only gotten a few hundred movers so far, but already we've made great strides in homeschooling and other realms of personal liberty. Between the established and new organizations, we have packed hearings for gun bills in Concord and made our voices heard loud and clear.
The most recent victory (not yet complete) was beating back an attempt to ban possession of firearms in the State House and Legislative Office Building introduced by an oath-violating state rep.
Check out
http://www.nhliberty.org/ as well, and its forum. The organization was founded by Free Staters and has been extremely active in tracking legislation and keeping people informed about legislative actions affecting freedom.
We have a handful of people who've moved here from out of country as well, and more members of the project who are hoping to do so.
If you can get a tourist visa, consider coming to the Porcupine Festival in June.
Regardless of which way the Supreme Court goes, New Hampshire has Article-2a: "All persons have the right to keep and bear arms in defense of themselves, their families, their property and the state."