Mahama was the overwhelming favourite among seven candidates, winning 95 percent of 213,487 votes cast on Saturday, making him the flagbearer of the National Democratic Congress.
Mahama was president from 2012 to 2016, when he lost a re-election bid to President Nana Akufo-Addo of the New Patriotic Party (NPP) over a faltering economy and corruption allegations.
“Tonight, I want to serve notice to Ghana that from the outcome of this election, the NDC is strong,” Mahama said after his victory was announced.
“The NDC is united. The NDC is poised for victory in 2020. And nothing, absolutely nothing, can stop our march towards Flagstaff House (the seat of government),” Mahama said at the social democratic party’s headquarters in Accra.
“It is a call to duty, a call to action and a call to battle. I wish that this fire will keep on burning… It is my hope that we will work together and eschew all attempts to divide us,” he said.