Two Republicans are vying for the chance to take on Democratic Congressman Jim Oberstar in Minnesota's 8th district, stretching from the Iron Range down to the northern Twin Cities suburbs. Oberstar has held the seat for 26 years. But so far, much of the Republican attempt to unseat him has centered more on an internal dispute on who should control the party. Minnesota Public Radio's Stephanie Hemphill reports. { The dispute boils down to this. Bob Lemen, a Grand Rapids computer consultant, has the GOP party endorsement. Warren Nelson, an engineering consultant from Chisago County, says the endorsement should have gone to his friend Mike Darling. Darling's candidacy did get a vote of support, but party leaders say it happened at a meeting which was not meant to endorse anyone. Darling is now running as an independent.