Ron Paul could raise enough money to mount a serious third-party bid for the presidency. And if he were (again) the Libertarian Party nominee, he would have fewer problems with ballot access. Is he thinking about it? See this interview:
Juan Williams, FOX News: "Everybody in this town thinks there is going to be a third-party candidate. An independent candidate. If you don't get the Republican nomination, could that independent candidate be Ron Paul?"
Ron Paul, candidate: "Look, Juan, you have to realize let's say that I was thinking about that and I said that. Then it would undermine what I'm doing. I'm running for president. I'm doing pretty well, I'm in third. So, no, I'm running for president in the Republican party, I'm doing very well. And last time they wondered about it, but, you know the whole thing is, is boy the people are really frustrated. You go to New Hampshire there are more independents then Republicans or Democrats."
Williams: "But what you're saying is you are not saying that you will not run as an Independent."
Paul: "Well, I say, is that I have no plans to do it."
Bret Baier, host: "So, how about are you big on pledges? Would you pledge here tonight that you would not run in a third party?"
Paul: "I pledge that I have no intention of doing it."
Paul: "I'm running for this Republican primary!"
Baier: "That sounds pretty political, Congressman."
Paul: "Well, you know, I have to vacillate a little bit in my life."
Charles Krauthammer: "We need a grammarian to work on that sentence."