IT was another set back for the immediate-past governor of Oyo State, Mr Abiola Ajimobi as his ambition to challenge the election of Senator Kola Balogun of the ruling Peoples Democratic Party (PDP) hit the rock, just as the Oyo State National and State Houses of Assembly Election Petition Tribunal sitting in Iyaganku, Ibadan, on Tuesday, upheld Balogun's election.