East Carroll Parish, Louisiana, has the largest rich-poor gap in the country, according to census data. As part of CNN's Change the List project, John Sutter and Edythe McNamee traveled to the state to find out why - and to see what lessons Income Inequality, USA, would have for the rest of the nation. Income inequality has been widely covered in the news media, but this series of op-eds and a “digital doc” video were praised for their intimacy and originality: They showed the social costs of the income gap. When the gap becomes so incredibly wide, it's almost impossible for people to see across. The main op-ed and digital doc focused on Delores Gilmore, an overnight prison guard and single mother. She lives in Lake Providence, the largest town in the parish, where a lake neatly and cruelly divides rich from poor. Gilmore knows almost nothing of the richer side.