Except that oil prices are driven by fears about changes in supply, and the insurgency in Iraq has driven those fears through the roof ever since we went. Plus, every time Bush rattles his sabre at Iran, up ratchets the price as well.
Venezuela crude is crappy stuff compared to what is pulled up out of the middle east. It's only the fact that the war-driven instability in Iraq and the rest of the region has driven oil prices up so high that Venezuelan crude has become price-efficient. (I believe it has to be well above $50 a barrel for people to bother with their stuff).
So yes, the prices that were driven up by the war have rather directly given Chavez additional world clout as it brought Venezuela's supply into play. If oil were to somehow magically drop back to $35 a barrel, the Venezuelan economy would completely tank.
-Arlos