U.S. Rep. Chip Cravaack addresses a crowd of slightly more than 200 people during a town meeting Wednesday at the Duluth International Airport in Minnesota. Steve Kuchera/AP/The Duluth News-Tribune hide caption

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In this image provided by Crossroads GPS, an ad took aim at Democrat Joe Sestak in Pennsylvania's contest for the Senate in 2010. Crossroads GPS/AP hide caption

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Trent Lott is a veteran of the Senate GOP leadership. He now heads the Breaux Lott Leadership Group, one of Washington's most powerful lobbying firms. AP hide caption

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On Thursday, the Federal Election Commission gave comedian Stephen Colbert the OK to form a superPAC. Mark Wilson/Getty Images hide caption

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President Obama shakes hands with a group of supporters after a Miami fundraiser on June 13. J Pat Carter/AP hide caption

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Attorney James Bopp talks to the media outside the Supreme Court on April 28, 2010, after arguing a case testing whether the names on a petition asking for the repeal of Washington state's domestic partnership rights should be kept secret. Evan Vucci/AP hide caption

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