If only it were that simple. Oil will always find a market.
Trading With the Enemy: U.S. Refiners Reportedly Buying Most of Iraq's Oil
Pooty-poot's got over $40 billion reasons to keep us from invading Iraq.
Stopping oil from Iraq and Saudi Arabia would put a dent in the US oil supply, but wouldn't cripple it. We also rely a great deal on other countries- including South American countries for oil, who could easily step up production. I'm not saying they could cover the loss, but it certainly wouldn't be as big a mess as some would have us believe if we told SA and Iraq to take a hike- and shove their oil too.