The Democrat says that his Republican rival is in the pocket of oil companies and notes that contributions to Mr McCain from oil executives rose in the days after his turnaround on offshore drilling.

ECONOMIST: The rivals for the White House have different energy plans

Pricing 150, 000 equity options in a second or assessing how much crude oil sits in a pocket 6 miles below the earth's surface are massively parallel mathematical computing problems for which graphics processors are peculiarly equipped.

FORBES: Magazine Article

He supports repealing the tax break for oil companies and he's tried to paint McCain as a candidate who is "in the pocket" of big oil corporations.

CNN: Energy compromise offers test for Obama, McCain

But the Democrats were out over the weekend with new talking points, saying that Republicans are in the pocket of big oil, that they want tax breaks for the companies, like Exxon, making record profits.

NPR: Analysis: Congress And The Cost Of Energy