Who's more conservative? Ron Paul? Or Newt Gingrich?
In my mind, there is no debate. Gingrich is a big government progressive establishment Republican. His relationship to the constitution is academic. Ron Paul is a small government libertarian conservative. His relationship to the constitution is visceral and near absolute. So absolute that he completely takes himself out of consideration for an entire voting bloc because his version of conservative foreign policy is complete isolationism and fails to make moral distinctions between allies and enemies. But there is no question that Ron Paul is as ultra-conservative-libertarian as Newt Gingrich is ultra-establishment progressive GOP.
In other words, aside from the quirkiness and the vapid foreign policy, Ron Paul's policy positions are exactly what the conservative electorate has been pleading for. That is going to be attractive to many, many people.
If Ron Paul runs 3rd party, it's game over - Obama wins. There is no way possible to deride, shame, and cajole enough of his followers and enough anti-establishment Republicans to give the vote to Gingrich. Glenn Beck's comment will not make Ron Paul's 3rd party run any more damaging to a Newt Gingrich GOP run than it would otherwise be without it*. If Paul run's it's game over. Beck could say the exact opposite of what he said, and it would still be game over.
*ETA: Without Beck's comment, that is.