I just put my own name on this list for a letter to Congress regarding the NSA spy ring. It is sponsored in part by Mizilla Firefox. There is a place for organizations to also sign up; I noticed the Green Party is listed, but I did not look for the name of the other parties.
If the link does not work for you, just put www.stopwatching.us on your browser, which is what I did.
I propose the LPSF sign up, if activists on this list are in agreement.