Pro-Obama groups launch $1 million ad buy tying Mitt Romney to big oil

The pro-Obama Super PAC Priorities USA Action and the League of Conservation Voters Victory Fund have spent $1 million in a television and online ad buy in two states'Colorado and Nevada'to air this ad focusing on Mitt Romeny's ties to big oil.

"Big oil's fingerprints are all over him," the ad says, pointing to reports that conservative groups - including Americans for Prosperity, backed by the wealthy brothers Charles and David Koch - plan to spend $200 million in support of electing Romney.

These are two key states for President Obama in 2012. He took Colorado handily in 2008, by eight points, and Nevada by 12 points. But the states can't be taken for granted this year, even the big edge Obama holds with Latino voters in the West. Nevada, particularly, has been economically devastated in the great recession.

It reminds voters in these less-than-prosperous states of Romney's big money and the massive $200 million commitment big oil has made to make him president. While they're paying higher and higher prices at the pump, the companies driving those prices higher are trying to buy the White House.