ACCRA - John Dramani Mahama was sworn in as Ghana’s new president on Tuesday, hours after John Atta Mills, the country’s leader, unexpectedly died at a hospital in the capital, Accra. A Reuters journalist in parliament said Chief Justice Theodora Georgina Wood swore in Mahama, who will complete Mills’ term that was due to expire at elections in December. Ghanaians congratulated themselves on the seamless handover. Mahama, 53, a historian, former minister and communications expert, is expected to bring a steady hand to a fast-growing economy, one of Africa’s newest oil producers. But questions over who will now step into Mills’ shoes as the candidate to keep his governing National Democratic Congress (NDC) in power in December’s elections will inject some uncertainty into the political outlook.