Well, actually, his actions did.
The simple threat of cranking up drilling in this country was enough to cause OPEC to drop their prices in 2008 in an attempt to save their sacred cow. They realized that their exorbitant prices were driving the U.S. to once again drill at home.
You can whine and say it isn't true, but it is a FACT ... I've posted the numbers and graphs before.
When the Scandaldaddy came into power, he backed off of the plans for self sufficiency in terms of oil production. The price drop slowed and on or about January 20, 2009, returned to their meteoric rise.
With no incentive to lower prices, and no threat of increased competition in the U.S., OPEC (Hmmmm... aren't most of its members Muslim countries?) felt free to raise prices back to previous levels. Only when sales began to slump did the price come down for a while ... but they're heading back up.
Since his policies caused the rise in prices, the Scandaldaddy effectively set the gas prices.