Five Republican candidates have already qualified to challenge U.S. Rep. John Barrow.Barrow, a Democrat from Augusta, is seeking a sixth term in Congress. He represents the 12thCongressional District, which includes Treutlen, Laurens, Wheeler.Through noon Tuesday, these candidates have qualified to challenge him:Delvis Dutton of Glennville, who owns a well-drilling company;Diane Vann of Macon, a...