House members and those newly elected to the Legislature gather in the House chamber at the Arkansas state Capitol in Little Rock, Ark. Nov. 7, 2014. Arkansas' legislature is just one of 31 state legislatures in Republican control. Danny Johnston/AP hide caption

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The amount of money spent on Capitol Hill is way more than small change — but the impact of that money is a little murky. Here, the U.S. Capitol is reflected in a fountain full of coins on Election Day this year. Mark Wilson/Getty Images hide caption

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Republican U.S. Senate candidate Dan Sullivan greets supporters on election night in Anchorage. The as-yet-undecided race between Sullivan and Democratic incumbent Sen. Mark Begich was the hottest in the state. Ted S. Warren/AP hide caption

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Tom Steyer recently said in a video that "climate change is not just an important issue, it's the issue. And we need leaders who will take it seriously." Isaac Brekken/Getty Images hide caption

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Among outside groups — that is, not candidates or party committees — more than half of this cycle's political ads are financed by secret donors. iStockphoto hide caption

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SuperPAC NextGen Climate Action aired a 60-second ad about Iowa Republican Senate candidate Joni Ernst featuring two rich guys with a briefcase full of cash. YouTube hide caption

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People stand with signs on Capitol Hill as Senate and House Democrats called for an amendment to the Constitution aimed at curbing special interests' financial clout in elections. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP