Where claims in a case were entirely based on state law, mere existence of a federal issue did not confer subject-matter jurisdiction. The 7th U.S. Circuit Court of Appeals vacated a decision by U.S. Magistrate Judge William E. Callahan Jr., Eastern District of Wisconsin. WEA Insurance Corp., which administers health-care programs on behalf of school districts in Wisconsin, told the school districts that it represented that it would collect money from the federal government designated to reimburse employers and …