Angola's main opposition party UNITA start voting for new leader UNITA, Angola's biggest opposition party, votes for a new leader after the decision of Isaias Samakuva to step down. The 73 year-old took the helm of UNITA in 2003, a year after its founder Jonas Savimbi was killed in battle with government troops. But the former rebel group has lost every election it has contested since Samakuva transformed it into an opposition party. IMAGES