Colombians head to the polls on 25 May to vote in presidential elections. Opinion polls put the two leading candidates very close and most pundits believe neither will score the more than 50% of the votes needed to win outright. A second round therefore looks likely.
The two leading contenders are the incumbent president, coalition National Unity candidate Juan Manuel Santos, and former finance minister Oscar Ivan Zuluaga of ex-President Alvaro Uribe's right-wing party Democratic Centre.
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