[1] Since no candidate received more than 50% of the votes, a run-off election was held on 28 December 2008 between the two candidates who received the most votes, Nana Akufo-Addo of the governing New Patriotic Party and John Atta Mills of the opposition National Democratic Congress.Although he fell short of the required 50%, the second-place candidate, former Trade Minister John Alan Kyeremanten, conceded defeat and backed Akufo-Addo.[13] Prior to the announcement hundreds of NDC supporters converged on the election headquarters demanding that Mills be declared the victor, but were kept at bay by riot police and armed soldiers.[15] Held in Accra, the conference was titled Colloquium on African Elections:Best Practices and Cross-Sectoral Collaboration.[15] The conference was organized by a number of international election reform organizations including the National Democratic Institute, the Africa Center for Strategic Studies, the International Foundation for Electoral Systems, the Netherlands Institute for Multiparty Democracy, the Open Society Initiative for West Africa and UNDP.