By controlling the oil in Iraq, we would have mollifed the power of OPEC and controlled the price of oil.
Unfortunately it looks like OPEC does not control the price of oil any more. You need to be able to raise production to control it. From a geo-political stand point it made sense to invade Iraq. Iraq has huge under explored reserves, they had no friends and all the remaining big reserves are around the Caspian basin. Ironically they are still below pre-war levels of production. That would be funny huh, If there was not as much oil over there that we thought. What a waste.
We are going to be in that part of the world for a long long time. The War on Terror is controlling the oil and controlling the population from the affects of depleting oil supplies.
Does anybody really think we want democracy in Iraq? They might decide not to give us any oil.