He's been elected into congress 10x as a Republican and in '88 while on the Libertarian ticket he was still a registered Republican. Being in any 3rd party would have only gotten him less media coverage then he is getting now.
I'll write-in Ron in the primaries if he doesn't make it or get on a 3rd party ticket. I don't know if he will win but at least more people now know his positions then they did a year ago and his message will resonate to future elections. Ron has inspired many of his followers to get into politics at the local level to try and change things from the ground up. Maybe in 10 years we can look back and say Ron was on to something. If you don't believe me go check out his book "A Foreign Policy of Freedom: Peace, Commerce, and Honest Friendship ". Its a collection of all his floor speeches in the house of Reps. Compare what he was saying 10-15 years ago to where we are now today and you can see he was spot on.
Ron's got a new book coming out in April called "The Revolution: A Manifesto" which is currently #3 on Amazon and #13 on Barns and Noble. Apparently us spammers got ahold of a credit card. ;) The preface to the book can be found here :
Ron Paul Book Bomb. I've got 6 books on order, one for me, three to be mailed to family members, and the last two will be donated to the public library.