High polarization between right-wing outsider Abelardo de la Espriella and left-wing Historic Pact candidate Iván Cepeda has sustained strong voter engagement ahead of the June 21 runoff, following a first-round turnout of 57.89 percent—the highest in recent Colombian presidential contests. The May 31 results showed the two finalists capturing over 84 percent of valid votes amid structural divides, with analysts noting that mobilization of the roughly 42 percent abstainers, centrist supporters of eliminated candidates, and undecided voters could lift participation further. Runoff dynamics, including endorsements from third-place finisher Paloma Valencia and appeals to swing blocs in key regions, have reinforced trader expectations that participation will exceed the first round. This positions the 60-64 percent band as the consensus range, while lower brackets reflect uncertainty over whether abstention patterns from the initial vote will persist.