Sean at myelectionanalysis makes great use of a Harry Potter reference in his reflection on the Ames, Iowa strall poll, speaking of Sam Brownback's taking third place and Mike Huckabee's coming in second:
I know a lot of people think that his third place showing is enough to keep him in the race. I’m not so sure. He threw everything he had into Ames, and still came up short. I think donors who are considering Brownback are going to look long and hard at him, then turn to Huckabee. One of them needs to exit quickly though, as neither can live while the other survives.
This is such a nice appropriation of pop culture that I had to mention it here, but I think it's accurate too. Huckabee and Brownback are marketing themselves to those who because of some intellectual vice (ignorance, too comfortable accepting lies without checking them, inconsistency in who to trust) see Romney as a pretender to the pro-life label. Huckabee could be a contender, but if Brownback is taking much of his support he's not going to have a chance. Brownback doesn't have much of a chance if Huckabee steps out, but the same is not true in reverse. So on the assumptions of those who wrongly fail to recognize that Romney is the best pro-life candidate (which is all that's driving the Brownback campaign at this point), Brownback ought to get out.