Editor's Note: For geopolitically significant elections, RANE publishes detailed scenario analyses that outline potential outcomes of the vote and their various domestic and international implications. Our previous scenario analyses have covered elections in Germany , Canada , Australia , Poland , South Korea , Japan ( twice ), Guyana , Norway , Moldova , the Netherlands , Chile , Bangladesh , Denmark and Peru . Colombia will hold the first round of its presidential election on May 31, with a runoff on June 21 if no candidate receives more than 50% of the vote. The winner takes office on Aug. 7.