You have to give props to Ron Paul for being political astute enough to know that he wouldn’t win a third party run and that he should fight to retain the position of power that he already has:

Presidential hopeful Ron Paul said he will not run as a third-party candidate in a new message to supporters that seems to recognize his slim chances at getting the Republican nomination.
The Texas congressman wrote on his Web site Friday that he is making cuts to his national campaign staff and that he must also stay focused on not losing the primary for his House seat.
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“With Romney gone, the chances of a brokered convention are nearly zero,” Paul wrote. “But that does not affect my determination to fight on, in every caucus and primary remaining, and at the convention for our ideas, with just as many delegates as I can get.”