David Koch, executive vice president of Koch Industries, attends an event at The Economic Club of New York last year. Mark Lennihan/AP hide caption

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The Supreme Court denied the petition of businessmen who say the 2010 Citizens United ruling makes it legal for corporations to contribute directly to candidates. The court building is seen here during renovations in December. Alex Wong/Getty Images hide caption

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The U.S. Supreme Court agreed to hear a challenge to campaign-finance laws that could open the door to further money in politics beyond what Citizens United achieved. Chip Somodevilla/Getty Images hide caption

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Sen. Robert Menendez of New Jersey, shown in June, has come under scrutiny before, but has never been charged. Mike Coppola/Getty Images hide caption

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Screenshot of a 2012 TV ad, featuring actor Clint Eastwood for Mitt Romney, by the Republican group American Crossroads. Screenshot of American Crossroads Ad hide caption

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Tourists take photographs in front of the U.S. Capitol on Jan. 2, the day after Congress passed a bill to avoid the fiscal cliff. Saul Loeb/AFP/Getty Images hide caption

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At a news conference last month, New York City Mayor Michael Bloomberg stands with people who have been affected by gun violence. John Moore/Getty Images hide caption

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Construction was under way on Capitol Hill in November for President Obama's Inauguration Day ceremonies. J. Scott Applewhite/AP hide caption

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Former U.S. Sen. Chuck Hagel, R-Neb., speaks at the White House on Monday after President Obama nominated him to replace Defense Secretary Leon Panetta. Mark Wilson/Getty Images hide caption

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Republican strategist Karl Rove, shown at the Republican National Convention in August, is arguing for continued secrecy for the new class of million-dollar political donors. David Goldman/AP hide caption

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In this photo illustration, a Rock River Arms AR-15 rifle is seen with ammunition. Joe Raedle/Getty Images hide caption

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