Nir Rosen, recently back from Iraq, rebuts the idea that Sunnis are going to stage a repeat of the 2005, when they boycotted elections and turned instead to militias for power. This is part of the general worry amongst American policymakers that for all the successes of the surge, there is still no political reconciliation and no agreed method for distributing government revenues. Money quote:

...what can Sunnis do? Nothing, they're screwed and they have to accept it, and they have. The alternative is far worse for them. Sunnis in the region will not go to war alongside the Sunnis of Iraq. That moment came and went in 2006. Iraqi Sunnis don't even have a single leader who is charismatic and has real appeal, they're divided among themselves and these days your average Iraqi just isn't that into politics. I've heard it hundreds of times by now, they blame the religious parties, they say they got fooled and now they understand. Now that's not completely true, but the militias were able to mobilize people because of a security vacuum. These days it doesn't matter how remote and shitty the village I visit is, there are Iraqi Security Forces, and people have good things to say about them. Compared to the first three years of the occupation, Sunnis seem downright docile, maybe bitter or wistful, maybe angry, but their leadership is emasculated, in jail, abroad, just trying to survive, or just trying to make money.