Kind of a wild question, but out of the modern (when I say modern, I mean in the past 50 or so years), which politicians would be most likely to start one in North America (that being Canada and the US?)
I could see Ron Paul starting up a version of Galt's Gulch somewhere in Texas and attract all sorts of people of Libertarian persuasion.
Cynthia McKinney could probably start up some kind of truther fantasy land with Cindy Sheehan and company. It would be basically some kind of anti-American paranoid hellscape that would degenerate eventually into your normal socialist cult except with scheduled flag burnings and anti-white hate.
I guess I could see someone like Mike Huckabee or a really super hardcore Social Conservative Evangelical type secluding from society and setting up some kind of religious cult.