A composite image shows part of the NPR/Center for Responsive Politics reporting team's whiteboard at NPR headquarters that was used to map out how Wellspring connects to other social welfare groups. (Click the enlarge button to see a full-size image.) John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

The Au Sable River in Michigan is a popular place for fly fishermen and the heart of a debate unexpectedly influenced by largely invisible social welfare organizations. Christine Arrasmith/NPR hide caption

itoggle caption Christine Arrasmith/NPR

Vice President Joe Biden swears in Sen. Cory Booker (D-NJ) as his mother, Carolyn, holds a Bible on Thursday. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

An evening view of the Exxon Mobil oil refinery complex in Baton Rouge, La. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

The Houston Ship Channel is home to a wide range of heavy industry, including chemical processing plants and petrochemical refineries. Richard Harris/NPR hide caption

itoggle caption Richard Harris/NPR

Frank Morris (in the apron and visor) stands in front of his shoe shop in Ferriday, La., in the 1950s. He was killed when his shop burned down in 1964. Courtesy of the Concordia Sentinel and William Brown hide caption

itoggle caption Courtesy of the Concordia Sentinel and William Brown

Jasper Burchfield was a 36-year-old part-time constable when he shot and killed Queen in 1965. Joseph Shapiro/NPR hide caption

itoggle caption Joseph Shapiro/NPR