The Goiás Senate race for the two seats up in October 2026 features a crowded field of more than ten registered candidates, with trader prices reflecting a tight contest for first place among Cíntia Dias, Gracinha Caiado, Guilherme Darques, Dr. Zacharias Calil, Gustavo Gayer, and several others clustered in the low-to-mid teens or lower. Recent July polling from Genial/Quaest showed Gracinha Caiado ahead at 20% with the second spot fragmented and undecided voters exceeding 30%, while later market pricing has elevated Cíntia Dias. High undecided shares, vote-splitting across parties, and limited differentiation so far keep the leader’s margin narrow. Visibility through candidate interviews, asset disclosures, and coalition-building in the coming weeks could shift support, as could any new state-level polling or endorsements that consolidate preferences before the October 4 first-round vote.