A large earth-mover carries PCB-contaminated soil from the Hudson River in New York to a burial pit at Waste Control Specialists near Andrews, Texas, in October 2009. Betsy Blaney/AP hide caption

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Republican presidential candidate Texas Gov. Rick Perry has three superPACs supporting his race. A new pay-to-play rule that does not affect his rivals is expected to put a crimp in Perry's campaign fundraising and likely will also hurt the superPACs that support him. Sue Ogrocki/AP hide caption

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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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