I have two points to make:

First, Iran vs. the World does not constitute a world war.

Second, the effect on the price of oil would be similar to the effect that the war in Iraq had: extremely temporary and inconsequential.

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I find it extremely ironic that many of those who claimed that Bush was the worst president in history claim that Obama is possibly the greatest thing to ever happen. If it is policy you are concerned with, then Obama is simply more of the same. More spending, more deficit, more foreign involvement, more government intervention, and more government regulation. Only a true partisan would claim that Obama represented change as the only change is the party he's from.