Cross-posted from ThinkProgress Green.

The Obama campaign is acting as if it is already in a general-election fight, against a Big Oil-Mitt Romney ticket. In a new ad, President Obama attacks “Big Oil” and Mitt Romney, pushing back against oil-industry campaign ads that accuse Obama of raising gas prices. The front group American Energy Alliance, secretly funded by Koch Industries and other oil giants, is running a $3.6 million ad campaign that criticizes Obama policies that don’t favor the oil-industry agenda. Oil companies have been profiting from American suffering at the gas pump, but they believe they would do even better under a Romney presidency, the new Obama ad argues:

Under President Obama, domestic oil production’s at an eight-year high. So why is Big Oil attacking him? Because he’s fighting to end their tax breaks. He’s raising mileage standards, and doubling renewable energy. In all these fights, Mitt Romney stood with Big Oil, for their tax breaks, attacking higher mileage standards and renewables. So when you see this ad, remember who paid for it and what they want.

Watch the ad:

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Because of Citizens United, the spending by Koch-funded front groups on this election is practically unlimited, especially as the oil industry pulls in $200 million more every time the price of gas goes up a penny.