Senator George LeMieux has brought it out into the light in indisputable fashion, the President has made himself as much an obstacle to dealing with a disaster as Mayor Ray Nagin did in the disaster his city suffered. In fact, he's done worse. At least Schoolbus Ray didn't keep turning away schoolbuses after allowing his own fleet to be flooded out.
No matter what the President says about the value of oil drilling and offshore oil production (which he appeared to support with political actions taken just before the BP oil spill), we have a big spill now. It's possible to deal with this spill. The means for doing so are proven and in hand. But he's stood in the way the whole time, first through inactivity then through outright opposition.
Check out the Senator's page for the details on the oil spill response.