Jeb Bush speaks to an audience of voters on Feb. 18 in Columbia, S.C. Bush dropped out of the GOP presidential race two days later, after finishing a distant fourth in the state's primary. Spencer Platt/Getty Images hide caption

toggle caption Spencer Platt/Getty Images

Democratic mayoral candidate Jim Kenney benefited from a super PAC that helped him win in the city's Democratic primary election. Matt Slocum/AP hide caption

toggle caption Matt Slocum/AP

Coming To A Mayor's Race Near You: SuperPACs Moving Into Cities

  • Download
  • <iframe src="https://www.npr.org/player/embed/451946805/452247116" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Rick Perry ended his presidential campaign Sept. 11, but there was $13 million left in the bank of a superPAC supporting him. The superPAC says it's given donors their money back. Scott Olson/Getty Images hide caption

toggle caption Scott Olson/Getty Images

Demonstrators march in the snow outside the White House during a rally against the Supreme Court's decision five years ago in favor of Citizens United, which allows private citizens and corporations to make unlimited donations for political campaigns. Nicholas Kamm/AFP/Getty Images hide caption

toggle caption Nicholas Kamm/AFP/Getty Images

2016's Campaign War Chests Are Just Jewelry Boxes Next To The Super PACs

  • Download
  • <iframe src="https://www.npr.org/player/embed/423434959/423435108" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

"Exploratory" Republican presidential candidate Jeb Bush speaks April 17 at the First in the Nation Republican Leadership Conference in Nashua, N.H. His super PAC — Right to Rise — is aiming to raise $100 million dollars by June 1. Brian Snyder/Reuters/Landov hide caption

toggle caption Brian Snyder/Reuters/Landov

17 Months Before Election Day, One Campaign Aims For $100 Million

  • Download
  • <iframe src="https://www.npr.org/player/embed/405091080/405125548" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Sen. Rand Paul, R-Ky., center, meets with members of the Londonderry Fish and Game Club in Litchfield, N.H., on Jan. 14. Paul was one of three GOP presidential hopefuls who attended Sunday's semiannual gathering of David and Charles Koch's donor network in California. Jim Cole/AP hide caption

toggle caption Jim Cole/AP

Comedian Stephen Colbert, left, holds a rally with former GOP presidential candidate Herman Cain at the College of Charleston in South Carolina. Richard Ellis/Getty Images hide caption

toggle caption Richard Ellis/Getty Images