If I got this right, we fight back by changing our avatars and putting banners on our blogs. Is that it?
However, there probably needs to some kind of bill to support or other action to be urging representatives to do, other than contacting them saying that "spying is bad". The Open Letter to HN from EFF, Demand Progress, and Cory Doctorow [1] mentions some of these, but the campaign site here doesn't seem to contain any mention of them.