A demonstrator rallies outside the U.S. Chamber of Commerce against the Supreme Court's decision in favor of Citizens United five years ago. Eight protesters at the Supreme Court were arrested and charged. Nicholas Kamm/AFP/Getty Images hide caption

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Former Florida Gov. Jeb Bush listens before a Nov. 20 speaking engagement in Washington. Susan Walsh/AP hide caption

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5 Years After 'Citizens United,' SuperPACs Continue To Grow
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Volunteers at the Lincoln Memorial help roll up a giant banner printed with the Preamble to the Constitution during an October 2010 demonstration against the Supreme Court's Citizens United ruling. Chip Somodevilla/Getty Images hide caption

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When Did Companies Become People? Excavating The Legal Evolution
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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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Voters participate in early voting Friday in Silver Spring, Md. Alex Wong/Getty Images hide caption

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Any Way You Describe It, 2012 Campaign Spending Is Historic
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Costumed demonstrators on Oct. 3 in Denver, before the first presidential debate. Doug Pensinger/Getty Images hide caption

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Study: Secret Donors Significantly Fueling Pro-Romney TV Ads
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Sen. Jon Tester, D-Mont., faces a potentially tough re-election bid. Win McNamee/Getty Images hide caption

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NPR's Martin Kaste on the Montana Senate race
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Sen. Jon Tester Decries Citizens United's Impact In Montana, Nationally
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GOP Gains Advantage After 'Citizens United' Ruling
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Peter Stone Rick Bloom hide caption

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'Citizens United' Ruling Opened Floodgates On Groups' Ad Spending
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