From the BBC: "Ghana's main opposition party has boycotted the swearing-in ceremony of President John Mahama following last month's disputed elections. The [center-right] New Patriotic Party (NPP) said Mr Mahama won the election fraudulently. Official results gave Mr Mahama 50.7% of the vote, enough to avoid a run-off against the NPP's Nana Akufo-Addo, who won 47.7%. Ahead of his inauguration, Mr Mahama called for unity in Ghana — seen as one of Africa's most stable democracies. Mr Mahama was Ghana's vice-president until the unexpected death of President John Atta Mills in July. He has served since then as acting president."
The article continues about the NPP's boycott: "Former President John Kufuor attended the ceremony, in defiance of the wishes of his party. Ghana's privately-owned Joy FM radio station reports that about 40 NPP supporters besieged the home of former President Kufuor to prevent him from attending the ceremony. 'Anybody who says that I have betrayed the NPP by attending President Mahama's inauguration is only following his emotions. Leading a nation is not easy so where I have reached, I am more of a statesman than mere party person,' he said, Joy FM reports. The party's MPs, however, did not attend the ceremony. The NPP filed a petition over the election result at the Supreme Court in late December, saying it had found irregularities including unregistered voters casting ballots."