Nigerian opposition candidate Peter Obi has been re-elected in a gubernatorial election seen as a test of whether Africa's most-populous nation is making progress in electoral reform. The Independent National Electoral Commission on Sunday declared Obi, of the All Progressives Grand Alliance, the winner of Saturday's election in Anambra State, according to dpa. The result came despite a host of problems: many polling stations were late opening, names were missing from the electoral register and there were reports of voter intimidation and ballot boxes being stolen. The last presidential elections brought Umaru Yar'Adua - who has been in hospital with a heart complaint since November - to power, but were marred by voter intimidation and vote rigging. Yar'Adua had vowed to reform the electoral system, and observers were watching the Anambra poll to see if Nigeria can hold credible presidential elections next year.