We get dozens of solicitations from the Obama campaign every day, based on how generous we were with our time and money for Obama in 2008. Here is an example of the kinds of replies I send back. I doubt they’ll send me a FREE BRADLEY MANNING! bumper sticker, though.
Do you write back to the campaign? I usually get a “Thanks for your reply” reply. I’ve never gotten a reply that didn’t seem to be automated.