The police shooting death of a man with a knife has roiled Wisconsin's capital and prompted politicians from the governor to city officials to call for transparency and accountability. City of Madison officials identified the man as homeless at a Thursday news conference that was interrupted by protesters. As cellphone video of the shooting circulated on social media, the Madison police chief urged people to remain calm pending an independent state investigation. The shooting also infused itself into politics ahead of Wisconsin's gubernatorial primary, with rival contenders weighing in.