Gibbs Knotts, chairman of the political science department at the College of Charleston, said the district’s conservatism is a factor.

“We’re in a conservative district in a very conservative state,” Knotts said. “It’s not just economic conservatism … but there are also a high number of socially conservative voters. It may be very difficult for these individuals to forgive Sanford for his past actions.”

http://www.usatoday.com/story/news/politics/2013/01/16/mark-sanford-congress-comeback/1838947/