Tevis ran for the KS house, and lost, probably in part because he tried to make a national movement out of the KS house (I followed the race somewhat closely and his fundraising was definitely part of the negative package aimed at him).
My point is, forget about a national political movement. Engage with local politics, for local reasons. "Move" towards real engagement, not the feel-good merit-badge engagement that this article alludes to, where by giving a buck and signalling your support you might help create some sort of "tipping point" that will fix national politics.
Anybody who's telling you that you can fix dysfunctional national politics by giving up your credit card number online is, obviously, selling you something. I bet a lot of people on HN could easily get themselves onto township planning committees, where they can actually make a real difference.