Tea Party activists gather on Capitol Hill in 2011. A surge in applications for 501(c)(4) status in recent years has revealed sometimes murky and contradictory rules governing the political activities of tax-exempt groups. Brendan Smialowski/AFP/Getty Images hide caption

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The lobbying industry in Washington is becoming more secretive. Bill Ingalls/NASA/Getty Images hide caption

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Republican U.S. Senate candidate Dan Winslow of Massachusetts wants same-sex married couples to have the same right to pool their money for political donations as other married couples. But the Federal Election Commission says the Defense of Marriage Act won't allow it. The constitutionality of DOMA is now before the Supreme Court. Charles Krupa/AP hide caption

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Senators Lisa Murkowski, an Alaska Republican, and Ron Wyden, an Oregon Democrat, discussing their new campaign finance legislation at an April 23, 2013 Capitol Hill news conference. Chip Somodevilla/Getty Images hide caption

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