The agreement reached by former Colombian president Juan Manuel Santos and the FARC guerilla group faces new challenges under right-wing Ivan Duque's leadership.
At stake is the implementation of a 2016 peace agreement with the FARC, which brought an end to five decades of conflict, and whether Latin America's fourth-largest economy will abandon its traditionally market-friendly posture.
It was the outcome millions of Colombians had hoped to avoid: A bitter run-off between two presidential candidates whose polarising viewpoints once again leave the nation divided.
For many Colombians this will be the first time they've had more than one viable choice in an election – and that might just trigger a run-off next month.
Calmest polls in half a century of conflict in Colombia, with the former rebel movement FARC spurning jungle warfare for politics, and the ELN – the country's last active rebel group – observing a ceasefire.
Recent opinion polls show just two percent support for the party, with many Colombians angry at the FARC, infamous for kidnappings, bombings and displacements, and believing its members should be in prison, not campaigning.
Colombia's upcoming elections might be turning into another referendum on the peace deal with the FARC.
Ex-presidents Alvaro Uribe and Andres Pastrana say they are focusing their platform on objections to the peace deal signed with the Marxist FARC rebels.
Peace commissioner Rodrigo Rivera said ruling should ease any worries among former FARC combatants that peace deal will not be violated.
On the third stop in a four-city Colombian tour, Pope Francis held an open-air mass in Medellin, the city known as the stronghold of the late drug lord Pablo Escobar.
The revised peace deal was put through Congress after voters shocked the world by rejecting an earlier version in a referendum last month.
The deal that aims to end 52-year-old armed conflict in Colombia will be taken up by the lower house of the Colombian Congress.
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