The news that Republican Presidential candidate Sam Brownback is withdrawing today from the race is a reminder that the phalanx of candidates on both sides is about to start thinning out. Like characters in an Agatha Christie murder mystery, both Republicans and Democrats will soon start disappearing from debate stages — slowly at first, then after the first primaries, quite rapidly. We will lose several colorful personalities who, for reasons of conviction or tactics, offered some of the more interesting policy choices and provocative comments. Regardless what you think about Ron Paul's libertarianism or Dennis Kucinich's social policy, both have made the campaign more interesting. (On foreign policy, their views even occasionally overlap — on Iraq, for instance, or warrantless wiretapping.) Whatever insights (or entertainment) these “second tier” candidates offer, they will be pressured to drop out early in the primary season if they can't poll above single digits.

Sam Brownback's problem was not that he was too colorful, but less so. His views on social policy were not far from Romney's and his views on terrorism similar to Giuliani's. If you enter the race without national name recognition or deep pockets, you have to cause a stir with your policies or the way you present them. The Senator from Kansas did neither.

Now the NYT's David Brooks wants us to help a more engaging candidate, the other “Man from Hope (Ark.),” Mike Huckabee, to step into the limelight. However, he acknowledges that Huckabee's foreign policy thinking is “thin.” Among other faults, Huckabee promises to make the United States energy independent within eight years. Statements like this will be challenged, and could nix the chances of a candidate until now best known for his weight loss. It's a tough reality, but it doesn't take much now for a candidate to get voted off the island and onto Brownback Mountain.