Send their fundraising envelopes back empty.
Yep, I do that along with a return address label so they know where it comes from. I'm told though that whoever opens the envelope is only interested in the check and its originator. Everything else, such as the stupid survey goes in the trash. I been enjoying the numerous "final notice" letters from the RNC expressing concern because I haven't sent in my membership renewal for 2007 (or '06, '05, '04.....). Guess it just takes time.
The causes of my disenchantment were McCain, Voinovich, Hagel, Lugar, Chaffee, and Grahamnesty.
I have sent their fund raising envelopes stuffed with spanish speaking news papers that are abundant here in san diego..