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Ahead of the polls, he met with four presidential candidates and assured the political parties that, their observation role will be undertaken in an impartial and transparent manner.
Mahama met with the current president, Arthur Peter Mutharika with 3 other presidential candidates.
President Peter Mutharika is in for a stern test on Tuesday's elections, challenged by a field of candidates including his deputy – a onetime ally turned rival – and a former pastor who accuses him of corruption.
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Mahama leads Commonwealth Observer Mission in Malawi
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Former law professor Mutharika, 78, is in the race to secure a second five-year presidential term is running against seven other candidates.
His presidency has been tarnished by corruption, despite his commitment to fight this scourge. He was personally involved in a $3.9 million bribe case.
Mahama leads Commonwealth Observer Mission in Malawi
The southern African country is heavily dependent on foreign aid and has suffered frequent severe droughts in the last decade that have affected hundreds of thousands of people.
Mutharika is credited with improving infrastructure and lowering inflation.
About 6.8 million voters will also elect their MPs and local councillors on the same day.
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Mahama leads Commonwealth Observer Mission in Malawi
Although women make up 56% of registered voters, there are no women among the candidates vying for president.