Personally, I don't think it is known if it is even possible to fix national politics. I think the US has been a totalitarian police state for many years. It continues to get noticeably worse every single year. This has been true for at least the last several decades.
As for local liberty, it has clearly been shown that it is possible to increase liberty in NH (though, this hasn't been shown anywhere else in the US, yet.)
I totally understand that there is only so much you can role back local government. If local government was 1/4 as large as it currently is in NH, perhaps there would be a stopping point for sometime. At that point, the easiest way to increase liberty would be to reduce federal influence. Thankfully, the federal government already doesn't give a dime to NH. In fact, NH is partially funding the federal government so we already have that on our side. We just need a popular governor to stand up to the federal government.
If I thought it was possible to bring about much greater freedom by spending 50 hours a week doing national liberty activism I wouldn't have joined the FSP and moved to NH where I know for a fact that I can make a positive different and actually influence policy. My believe is that even if Ron Paul or Gary Johnson got elected, they couldn't do as much to free the folks of NH as a libertarian governor could. Additionally, as soon as Ron Paul is no longer president, the federal government will continue to rapidly grow. Electing Ron Paul is a 4-8 year stop gap. It isn't a plan to greatly increase liberty over the long term. I have to consider the future of humanity, not just the next 8 years.