In January 1997 soros caused the price of silver to spike because he bought a ton of it, saying it was on sale at that price. Yes, you're right that he doesn't have enough money to influence the market directly, but a group of men could spread the notion that oil is the way to go. Once oil started climbing, everyone jumped on the bandwagon.
It is just too convenient that oil climbs when it will hurt President Bush/Republicans and fall when it will help obama and the dems.