Sen. Jim Guthrie, left, faces David Worley in the Republican primary election on May 19. (Photos courtesy of the candidates)In eastern Idaho’s legislative district 28, the chairman of a powerful committee in the Idaho Legislature is facing a challenger in the 2026 Republican primary election. Sen. Jim Guthrie, 70, a farmer and rancher from McCammon who chairs the Senate State Affairs Committee, is seeking re-election to an eighth term in the Ida…