Costa Ricans flocked to the polls Sunday to give an upset landslide victory to the ruling party, rejecting a conservative evangelical candidate who campaigned against same-sex marriage.
Carlos Alvarado Quesada, a 38-year-old novelist who served as labor minister in the current center-left administration of President Luis Guillermo Solís, beat Fabricio Alvarado Muñoz, 43, a former preacher and psalm singer who seized on opposition to same-sex marriage to vault to first place in the first round of elections. Mr. Alvarado Muñoz...