Ghanaian presidential candidates sign anti-violence agreement Ghana's main presidential candidates sign an agreement against electoral violence, impunity and injustice ahead a hotly contested presidential election on December 7 which look set to be a tight race between President John Mahama of the ruling National Democratic Congress (NDC), and Nana Akufo-Addo, leader of the New Patriotic Party (NPP) who is making his third and likely final bid for the top job. IMAGES AND SOUNDBITES