"Education of constitutional and conservative principles" would pass muster as a mission statement for the IRS as a non-profit. Just check the box on the IRS form that says: "Educational," and provide a one-paragraph narrative of the mission statement. The downside to a non-profit is the requirement of a elected board of directors, and so on...
I was on the board of a nonprofit conservative business club. We did fine until it came to supporting candidates. We got around that by saying we were only supporting candidates who were members of our club. We thanked our members for stepping up to the plate and running for office. But on this board, with no controls, I don't think we could get away with supporting GWB, etc. and still maintain our nonprofit status.