WICHITA, Kan. (AP) - The Democratic nominee in the Kansas 1st Congressional District has crossed party lines to endorse independent candidate Greg Orman for U.S. Senate. Former Manhattan Mayor Jim Sherow is challenging Republican Congressmen Tim Huelskamp in the sprawling U.S. House district of western and central Kansas congressional district. Sherow told The Associated Press on Thursday he believes Orman has the best chance to defeat Republican Senator Pat Roberts in November. Roberts also faces Democratic nominee Chad Taylor, but Sherow says many Democrats are supporting Orman because of his promise of bipartisanship. Sherow notes that 100 current and former Republican elected officials have endorsed Democrat Paul Davis for governor against GOP incumbent Sam Brownback. Sherow said strict party lines are breaking down in Kansas and a core middle ground is emerging.