Josh Putnam calculates that another candidate isn't going to enter the GOP race. Pareene builds off Putman's argument:

Newt Gingrich is doing everything in his power to ensure that Mitt Romney will have a difficult time winning the number of delegates necessary to ensure the nomination, but even if Gingrich manages to make good on his threat to drag this out, math has already effectively eliminated the possibility that someone else less insane could take advantage of his work. And the candidates credible enough to make a serious “deadlocked convention” play would be too sensible to attempt it, because the result of denying Romney the nomination would be utter chaos.

Yes it really is that much of a clusterfuck at this point. But I have to say that Romney's last Florida debate performance and the ruthlessness with which he has tried to dispatch Gingrich this week have impressed me. He has the overkill-type ambition to win. But why? That's a question to which I don't have an answer. At times, he seems like a human being programmed entirely for worldly success – almost a machine. And an attractive machine, with no obvious massive flaws, a perfect family, an inspiring family background … who obviously has had to think about the envy of others his entire life.

But why has this otherwise purring political and financial machine been unable to dismantle that envy? And break through that human disconnect? He's trying, obviously. He aims to please, as James Bennet once drily remarked. But for what? For the lyrics of "America The Beautiful"? For what? I still don't feel I know or understand this machine. I don't think I'm the only one.