Petro's hard-fought victory in June elections brought Colombia, long ruled by a conservative elite, into an expanding left-wing fold in Latin America.
Gustavo Petro, a former guerilla, who fought against the Colombian government in the past, will now lead the South American country.
Ex-guerrilla member Gustavo Petro leads the field to become the next president of Colombia, with leftist candidates projected to win most seats in the Senate.
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