A Zambian man casts his vote in a polling station of Lusaka on October 30, 2008. Zambians were voting in a presidential election -- but opposition leader Michael Sata accused police of scheming with electoral authorities to "rig" the result, again warning he would not accept defeat. Sata is locked in a neck-and-neck race against acting President Rupiah Banda, in a contest to replace president Levy Mwanawasa who died in August following a stroke. AFP PHOTO / ALEXANDER JOE (Photo credit should read ALEXANDER JOE/AFP/Getty Images)