Ironically, I can see both sides of this! I think tightening up rules on speculation could significantly lower gas prices, so Obama could do something about gas prices. But the chance of Congress doing something like that is pretty much zero.
The other things that can be done to lower energy prices, like increasing CAFE standards and promoting alternative energy, are being done by Obama. So we should give him some credit.
I think the main reason prices are rising now is because when the economy collapsed that depressed gas prices, and now that the economy is recovering they are naturally going back up. That and the Arab Spring, which destabilized several oil producing nations.