Recent polling from Datafolha and AtlasIntel shows Marcelo Castro (MDB) and Júlio César (PSD) holding the narrowest leads for the two Piauí Senate seats, with Ciro Nogueira (PP) close behind but facing higher rejection rates that limit his growth. The MDB-PSD coalition aligned with Governor Rafael Fonteles benefits from coordinated campaigning and Lula administration ties, while Ciro's independent push encounters structural headwinds in the final weeks. Júlio César's positioning as a strong second-choice option in multiple surveys underpins trader consensus on his edge for second place, though elevated undecided voters and the two-vote format leave room for late shifts from endorsements, turnout patterns, or alliance realignments before October 4.
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