Ragoczy, I honestly don't see what kind of hope you could have that an Iraqi government will become stable and sane, and neither give in to sects and tribes nor become a mere puppet of the US. The first seems the outcome of your view that it's a ragbag of a country that would dissolve fast unless kept together by force (isn't that what Saddam Hussein realized too?), and the other alternative, a puppet regime, means the US troops will stay for decades to come - and become a permanent recruitment poster for those militant movements that do not accept the idea of being puppeted. And anytime in the future when that unrest flares really high, more of those troops - young American men and women - would have to be sent in. So? This is exactly the quandary that the US found itself in as soon as the hot phase of the war was over and Hussein had fallen. They had no real idea how to build a civilian regime, to restore democracy. Some of the "leaders" they wanted to work with were the very kind of angry old mullahs that are the fear of every American schoolboy when they are reigning in Iran, just across the border.
As for your idea that the US can and should do what it wants - yeah okay, but then you'd have to agree that the Japanese attack on Pearl Harbor was a daring and extremely skillful act of war, don't you? And motivated too, because the Japanese felt hemmed in by the presence of the US navy and air force in the Pacific, and they could see that the age of European colonies in Asia was coming to an end. Who could argue with them if they aim to take the naval base out and run for the booty of east Asia and the Pacific?
I guess we've come a bit off the subject of what Obama will do if he's elected, but at least I think he sees that the matter of US presence in the Middle East isn't as simple as "our boys are there as a benevolent peacekeeper and to make sure things don't slide back to barbarism".