DULUTH, MN (KDAL) - 8th District Minnesota Republican Congressman Chip Cravaack will face off against his Democratic challenger Rick Nolan in a candidate forum on Tuesday morning in Duluth.  The forum is being sponsored by the Duluth Chamber of Commerce and the News Tribune.  It will be held at 8 a-m in the Duluth Playhouse at the Depot, 506 West Michigan Street.  The two candidates are also scheduled for another debate on October 16th in Cambridge.