The case for free trade of oil. If you're really worried about the risk of supply disruption hurting us militarily, then support something like Bush's proposed doubling of the Strategic Petroleum Reserve.

Update: Consider some relevant data from the DOE's website. In 2004, Canada and Mexico nearly tied for first place among exporters of crude oil to the U.S., each at 16% of total imports. Saudi Arabia was close behind at 15%. Overall, 25% of the imports were from states bordering the Persian Gulf.