A judge has blocked a sudden ban on the open display of guns near Michigan polling places on Election Day. Judge Christopher Murray acted Tuesday, just a few hours after hearing a challenge from gun-rights groups. They said Secretary of State Jocelyn Benson, a Democrat, had exceeded her authority in banning people from openly carrying guns within 100 feet of polling places. Critics argued that Benson failed to go through a formal rule-making process as required under state law.