Slovenians on Sunday backed membership of NATO and the European Union in a referendum overshadowed by the U.S.-led war in Iraq which has divided both blocs, exit polls showed. An exit poll broadcast by one television station just after voting finished at 1800 GMT showed voters endorsing NATO membership by 56.1 percent and EU membership by 90.3 percent. The country of two million people, which broke away from the former Yugoslavia in 1991, is the first to hold a referendum on accession to NATO among the seven former communist states invited last year to join by the military alliance.