The groups are working to educate voters in the South about how they would be affected if the court strikes down a key provision of the Voting Rights Act.
The longest-serving Black Democrat in Mississippi, Bennie Thompson is a formidable political force. But he is not immune to a national trend of younger candidates going after older incumbents.
Representative Bennie Thompson, Democrat of Mississippi, was first elected to Congress in 1993. He now faces a primary challenge from a much younger opponent.