Why stay in Iraq?

Following yesterday’s streets demonstrations in Najaf, a “damn if you pull-out and damn if you don’t” quandary, tenuous connection to al-Qaeda, continued US casualties and an obscene price tag of over $100 billion a year, I don’t understand why it’s taking us so long to bail out of Iraq? We should start drawing down troops now, not sometime in 2008! Am I missing something or what? Why is the new Democratic majority so coy about that? If -- as I suspect – oil is the reason, we should be able to negotiate a continuous flow to quench our gargantuan thirst and position our Navy to make sure tankers gets through the Strait of Hormuz. In the face of that, why is having our troops return safely home as soon as possible such a radical idea?