Turkey's main opposition candidate Ince holds giant rally President Recep Tayyip Erdogan's main rival in Sunday's polls Muharrem Ince holds a giant rally in Istanbul on the eve of the election. The candidate for the main opposition Republican People's Party (CHP) has in the space of weeks risen from being a fiery parliamentarian to a presidential contender who has energised the Turkish opposition and poses a serious challenge to President Erdogan. IMAGES AND SOUNDBITES