The open source method is probably a good way to organize a democratic political party. But the method of organization says nothing about the political stances taken by the resulting party. Rather than organizing a party and then trying to come up with a political platform it would be better to join a political party whose platform you agree with and try to get that party to reform itself to run on open source principles.
Without stating any opinion on the Tea Party political platform, I would like to say that the Tea party is the party in the United States that comes closest to being run on open source principles.
Off Topic:
SOPA just died.
http://www.macobserver.com/tmo/article/white_house_opposes_sopa_congress_drops_bill/
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Steve Stites