Technically Howard is right. Gigantorx went over this - lower demand, lower cost.
The economy is turning down again and prices are going down because of it. Notice how the high prices were in the "recovery", and now that shit is looking bleak again, prices are dropping?
Obama may not technically have been responsible for high gas prices, but none of his policies did anything to help IMHO.
Also read something about them shutting down production to switch over to their summer blend a few months back, im sure that contributed to the high prices until they were back to normal production.