George Soros, seen at a forum in Berlin last year, joined a superPAC backing a Hillary Clinton presidential run in 2016. Sean Gallup/Getty Images hide caption

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Sean Gallup/Getty Images

U.S. Rep. Joe Baca of California, shown at the 2008 Democratic National Convention, learned the power of superPACs firsthand this year, when he lost for the first time since he was elected in 1999. Jae C. Hong/AP hide caption

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Jae C. Hong/AP

How To Oust A Congressman, SuperPAC-Style

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A supporter of President Barack Obama raises his arms as it is announced that Obama was re-elected during an election night watch party in Chicago. Jerome Delay/AP hide caption

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Jerome Delay/AP

With Millions Spent, GOP 'Investors' Saw Little Return Election Night

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Voters participate in early voting Friday in Silver Spring, Md. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

Any Way You Describe It, 2012 Campaign Spending Is Historic

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The Campaign to Defeat Barack Obama, a small-donor PAC, has launched a bus tour to reach conservative voters in hotly contested states, while trying to raise money to launch an anti-Obama TV ad. Yfat Yossifor/Courtesy of Mlive.com hide caption

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Yfat Yossifor/Courtesy of Mlive.com

With Buses And Billboards, Small-Money Groups Try To Make A Mark

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U.S. Sen. Sherrod Brown (right), D-Ohio, debates his Republican challenger, Ohio state Treasurer Josh Mandel, at the City Club in Cleveland on Oct. 15. Tony Dejak/AP hide caption

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Tony Dejak/AP

In Key Senate Races, Outside Groups Outpace Candidates' Ad Spending

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Las Vegas casino magnate Sheldon Adelson watches a performance at the Sands Cotai Central in Macau in April. Kin Cheung/AP hide caption

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Kin Cheung/AP

Casino Owner Expected To Make $10M Donation To Pro-Romney SuperPAC

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