Seeing as Ron Paul has championed previous causes like this in the past he might be a good place to start. If we all send him (and perhaps Rand Paul or other like-minded legislators) they might express opinion publicly on this (or better yet, and depending on the support we're able to generate) legislation in this direction protecting Bitcoin.
At least it beats just waiting around for some branch of the government to start shutting down websites like MtGox or Bitcoin.org. We've seen that governments and the associated powerful interests around them go to great lengths to foist their currency on the public; as the devaluation of it through inflation, fractional reserve banking and bailouts is a hidden tax that, if alternative currencies were available the public, would have an alternative to paying.
Bitcoin is clever and revolutionary but being clever isn't enough. History has shown that you have to fight.
You do have to fight, however bringing more government attention to BTC (positive or negative) is not a good idea. It will only ensure that the government starts the process of attempting to regulate or ban BTC sooner. A better plan is what AllYourBase mentions, fight by making BTC a widely used currency, which will make it more difficult for the government to regulate or shut down.