The two contenders in Costa Rica’s presidential runoff on 1 April 2018, Fabricio Alvarado (PRN) and Carlos Alvarado (PAC), are diametric opposites on the issues that have dominated recent elections, and their supporters are also divided along geographic and socioeconomic lines. Thankfully, a healthy democratic context militates against the worst effects of polarisation, write Evelyn Villarreal Fernández (State of the Nation Programme) and Bruce M. Wilson (University of Central Florida).