By Wamundila Chilinda:The opposition National Democratic Congress -NDC has suffered a major setback on the Copperbelt after some of  its structures defected to the ruling Patriotic Front.Former NDC Chairperson for Kitwe, Edith Chili led her entire Executiveand other members in rejoining the PF.And leaders Masandiko Zimba and Eugene Zulu led youth wings in Mufulira, Luanshya,…