The anti-rights lobby has established a 'ban private sale' petition with the White House. They need to get 5000 votes for it to do any good. They aren't close.
However, there are some petitions well worth signing, such as support of HR822, and some others. Take a look, and if you feel so inclined, add your name to the petition. I won't say you must, but I would recommend it. Let's send a clear message to the executive branch that this is what we want!