**Gustavo Gayer (PL) leads the Polymarket probabilities for second place at 51.5%, ahead of a crowded field where Vanderlan Cardoso (PSD), Dr. Zacharias Calil (MDB), Gustavo Mendanha (PRD), and others trail in the low-to-mid teens or lower.** Late-August 2026 polls from Quaest and Real Time Big Data show Gracinha Caiado (União Brasil) clearly ahead overall for one of Goiás’s two Senate seats on October 4, while the contest for the remaining seat remains fragmented. Gayer consistently ranks as the strongest challenger for second in combined first-and-second-choice scenarios (12–17%), benefiting from party structure and voter recognition as a sitting federal deputy. The field stays tight because no single alternative has consolidated support behind Caiado; Cardoso, Calil, and Mendanha each poll in the 6–12% range in combined votes, with high undecided shares (25%+) and low spontaneous name recognition leaving room for late shifts. Traders price Gayer highest for second place as the most credible alternative in current surveys, but the outcome hinges on turnout patterns, campaign momentum, and any final alliances or debates before election day. Further polling or visible consolidation among center-right or opposition voters could widen or narrow gaps among the contenders.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedGustavo Gayer 51%
Vanderlan Cardoso 17.8%
Gustavo Mendanha 15%
Dr. Zacharias Calil 12.7%
$28,648 Vol.
$28,648 Vol.

Gustavo Gayer
51%

Vanderlan Cardoso
18%

Gustavo Mendanha
15%

Dr. Zacharias Calil
13%

Gracinha Caiado
11%

Iure Castro
5%

Ernesto Roller
3%

Cintia Dias
2%

Guilherme Darques
<1%

Isaura Lemos
<1%

Oséias Varão
<1%
Gustavo Gayer 51%
Vanderlan Cardoso 17.8%
Gustavo Mendanha 15%
Dr. Zacharias Calil 12.7%
$28,648 Vol.
$28,648 Vol.

Gustavo Gayer
51%

Vanderlan Cardoso
18%

Gustavo Mendanha
15%

Dr. Zacharias Calil
13%

Gracinha Caiado
11%

Iure Castro
5%

Ernesto Roller
3%

Cintia Dias
2%

Guilherme Darques
<1%

Isaura Lemos
<1%

Oséias Varão
<1%
This market will resolve according to the candidate who wins the second-most valid votes of any candidate at the specified election.
Candidates will be primarily ranked by order of valid votes won. If two or more candidates are tied for any position, ties will be broken by alphabetical order of the candidates’ listed full names as they appear in this market. This market will resolve to the candidate that occupies the second-highest finishing position after applying this ranking.
If the result of this election isn't definitively known by June 30, 2027, 11:59 PM ET, the market will resolve to "Other".
This market will resolve based on the result of the election, as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the Brazilian government, specifically the Superior Electoral Court (Tribunal Superior Eleitoral, TSE) (e.g., www.tse.jus.br/eleicoes/resultados-eleicoes).
Market Opened: Aug 17, 2026, 5:59 AM ET
Resolver
0x69c47De9D...This market will resolve according to the candidate who wins the second-most valid votes of any candidate at the specified election.
Candidates will be primarily ranked by order of valid votes won. If two or more candidates are tied for any position, ties will be broken by alphabetical order of the candidates’ listed full names as they appear in this market. This market will resolve to the candidate that occupies the second-highest finishing position after applying this ranking.
If the result of this election isn't definitively known by June 30, 2027, 11:59 PM ET, the market will resolve to "Other".
This market will resolve based on the result of the election, as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the Brazilian government, specifically the Superior Electoral Court (Tribunal Superior Eleitoral, TSE) (e.g., www.tse.jus.br/eleicoes/resultados-eleicoes).
Resolver
0x69c47De9D...**Gustavo Gayer (PL) leads the Polymarket probabilities for second place at 51.5%, ahead of a crowded field where Vanderlan Cardoso (PSD), Dr. Zacharias Calil (MDB), Gustavo Mendanha (PRD), and others trail in the low-to-mid teens or lower.** Late-August 2026 polls from Quaest and Real Time Big Data show Gracinha Caiado (União Brasil) clearly ahead overall for one of Goiás’s two Senate seats on October 4, while the contest for the remaining seat remains fragmented. Gayer consistently ranks as the strongest challenger for second in combined first-and-second-choice scenarios (12–17%), benefiting from party structure and voter recognition as a sitting federal deputy. The field stays tight because no single alternative has consolidated support behind Caiado; Cardoso, Calil, and Mendanha each poll in the 6–12% range in combined votes, with high undecided shares (25%+) and low spontaneous name recognition leaving room for late shifts. Traders price Gayer highest for second place as the most credible alternative in current surveys, but the outcome hinges on turnout patterns, campaign momentum, and any final alliances or debates before election day. Further polling or visible consolidation among center-right or opposition voters could widen or narrow gaps among the contenders.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated


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