A missing persons poster displays the photographs of civil rights workers Andrew Goodman, James Earl Chaney and Michael Henry Schwerner after they disappeared in Mississippi in June 1964. It was later discovered that they were murdered by the Ku Klux Klan. Bettmann/Corbis hide caption

itoggle caption Bettmann/Corbis

A new exhibit at the Mississippi state archives includes photographs, excerpts from journals and film clips documenting 1964's Freedom Summer. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR

Mississippi Sen. Thad Cochran, who is seeking his seventh term, is in a heated primary race with a Tea Party-backed challenger. Supporters of his opponent are accused of conspiring to photograph Cochran's bedridden wife. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Eddie Ramirez, 15, outside his mobile home in Snow Hill, N.C. He's been working in tobacco fields during the summer for several years. Will Michaels for NPR hide caption

itoggle caption Will Michaels for NPR

Mississippi state Sen. Chris McDaniel speaks to supporters in Jackson on Thursday. He is challenging Republican Sen. Thad Cochran in Cochran's bid for a seventh term. Rogelio V. Solis/AP hide caption

itoggle caption Rogelio V. Solis/AP

Jackson Women's Health Organization, located in an art deco section of Jackson, Miss., minutes from the state Capitol building, has long been a flashpoint in the abortion debate. Debbie Elliot/NPR hide caption

itoggle caption Debbie Elliot/NPR

Man-made canals built for the oil and gas industry cut through wetland. The industry argues those canals aren't to blame for coastal erosion. Robert F. Bukaty/AP hide caption

itoggle caption Robert F. Bukaty/AP