Recent polling from late August 2026, including Paraná Pesquisas and Quaest surveys, positions Janaina Riva (MDB) as the frontrunner for second place in Mato Grosso’s two-seat Senate race. Consolidated first- and second-preference results consistently place ex-governor Mauro Mendes (União) well ahead for the top spot while Riva holds the clearest path to the second vacancy, supported by her established legislative record, strong showing among women voters, and ongoing campaign activity on health and family-protection measures. Trailing candidates such as José Medeiros (PL), Pedro Taques (PSB), and Carlos Fávaro (PSD) register lower consolidated support and have shown limited movement since party conventions concluded in early August. High undecided shares remain, yet current survey trends underpin the market’s pricing of Riva well ahead of alternatives for the second seat.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedJanaina Riva 61%
Mauro Mendes 20%
Professor Nelson Ferreira 8.1%
Galvan 6.7%
$10,013 Vol.
$10,013 Vol.
Oct 4, 2026
Janaina Riva
61%
Mauro Mendes
20%
Professor Nelson Ferreira
8%
Galvan
7%
Jose Medeiros
6%
Pedro Taques
2%
Fávaro
7%
Beny Godoy
1%
Margareth Buzetti
<1%
Coronel Darwin
<1%
Janaina Riva 61%
Mauro Mendes 20%
Professor Nelson Ferreira 8.1%
Galvan 6.7%
$10,013 Vol.
$10,013 Vol.
Oct 4, 2026
Janaina Riva
$6,826 Vol.
61%
Mauro Mendes
$1,175 Vol.
20%
Professor Nelson Ferreira
$229 Vol.
8%
Galvan
$229 Vol.
7%
Jose Medeiros
$247 Vol.
6%
Pedro Taques
$364 Vol.
2%
Fávaro
$248 Vol.
7%
Beny Godoy
$240 Vol.
1%
Margareth Buzetti
$229 Vol.
<1%
Coronel Darwin
$229 Vol.
<1%
The Brazilian Federal Senate election for Mato Grosso is scheduled to take place on October 4, 2026.
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).Recent polling from late August 2026, including Paraná Pesquisas and Quaest surveys, positions Janaina Riva (MDB) as the frontrunner for second place in Mato Grosso’s two-seat Senate race. Consolidated first- and second-preference results consistently place ex-governor Mauro Mendes (União) well ahead for the top spot while Riva holds the clearest path to the second vacancy, supported by her established legislative record, strong showing among women voters, and ongoing campaign activity on health and family-protection measures. Trailing candidates such as José Medeiros (PL), Pedro Taques (PSB), and Carlos Fávaro (PSD) register lower consolidated support and have shown limited movement since party conventions concluded in early August. High undecided shares remain, yet current survey trends underpin the market’s pricing of Riva well ahead of alternatives for the second seat.
The Brazilian Federal Senate election for Mato Grosso is scheduled to take place on October 4, 2026.
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).
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, 6:03 AM ET
Volume
$10,013End Date
Oct 4, 2026Market Opened
Aug 17, 2026, 6:03 AM ETResolver
0x69c47De9D...The Brazilian Federal Senate election for Mato Grosso is scheduled to take place on October 4, 2026.
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).Recent polling from late August 2026, including Paraná Pesquisas and Quaest surveys, positions Janaina Riva (MDB) as the frontrunner for second place in Mato Grosso’s two-seat Senate race. Consolidated first- and second-preference results consistently place ex-governor Mauro Mendes (União) well ahead for the top spot while Riva holds the clearest path to the second vacancy, supported by her established legislative record, strong showing among women voters, and ongoing campaign activity on health and family-protection measures. Trailing candidates such as José Medeiros (PL), Pedro Taques (PSB), and Carlos Fávaro (PSD) register lower consolidated support and have shown limited movement since party conventions concluded in early August. High undecided shares remain, yet current survey trends underpin the market’s pricing of Riva well ahead of alternatives for the second seat.
The Brazilian Federal Senate election for Mato Grosso is scheduled to take place on October 4, 2026.
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).
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).
Volume
$10,013End Date
Oct 4, 2026Market Opened
Aug 17, 2026, 6:03 AM ETResolver
0x69c47De9D...Recent polling from late August 2026, including Paraná Pesquisas and Quaest surveys, positions Janaina Riva (MDB) as the frontrunner for second place in Mato Grosso’s two-seat Senate race. Consolidated first- and second-preference results consistently place ex-governor Mauro Mendes (União) well ahead for the top spot while Riva holds the clearest path to the second vacancy, supported by her established legislative record, strong showing among women voters, and ongoing campaign activity on health and family-protection measures. Trailing candidates such as José Medeiros (PL), Pedro Taques (PSB), and Carlos Fávaro (PSD) register lower consolidated support and have shown limited movement since party conventions concluded in early August. High undecided shares remain, yet current survey trends underpin the market’s pricing of Riva well ahead of alternatives for the second seat.
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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