Barack Obama campaigns in Kansas City today. He's winding his way through Midwestern battle ground states on his way to the convention in Denver, but the Illinois Senator may still have some convincing to do when he reaches the huge gathering of party faithful there. Last night he got some help from one of his early allies, US Senator Claire McCaskill. McCaskill turned away from some of her core supporters, and one of the few other women in the US Senate, choosing Barack Obama over Hillary Clinton. Now McCaskill is working to bring Clinton delegates into line behind Obama. KCUR's Frank Morris reports from Denver, Colo.