Will Eduardo Paes win the Governor of Rio de Janeiro election?

ResolutionResolved NO

YES payout0¢

NO payout100¢

VenuePolymarket

Realized · held to resolution−100%$100 paper stake

Polymarket80¢ → 0¢

Our position · YES80¢ → 0¢

Signal endedOct 16

Forecast updated

Sep 21 forecast

Sustained double-digit polling leads across multiple surveys make Eduardo Paes highly likely to win the Rio de Janeiro governorship.

Eduardo Paes has maintained a consistent double-digit lead over Douglas Ruas in every major poll since April 2026, with first-round numbers hovering around 39-43% and valid-vote shares near 49% – just shy of an outright majority. The removal of Cláudio Castro, his strongest potential opponent, via an ineligibility ruling in March 2026 cleared the field. Paes also benefits from President Lula's endorsement in a state where Lula remains popular. The large undecided bloc (40% in spontaneous polling) introduces some uncertainty, but late deciders historically break toward the known frontrunner in Brazilian elections. Though a first-round win is not guaranteed, the cumulative evidence makes his ultimate victory highly likely, whether on October 4 or in a runoff on October 25.

Points to YES

Eduardo Paes posts commanding leads in first-round and runoff polling.
Datafolha published September 14, 2026 showed Paes with 43% to Ruas's 25% in the first round and 49% to 28% in valid votes.
Main rival Cláudio Castro was banned from running, eliminating an experienced opponent.
The TSE condemned Castro on March 24, 2026 for abuse of political and economic power and declared him ineligible for eight years.
President Lula's explicit endorsement boosts Paes in a Lula-friendly state.
Paes stated on September 18, 2026, 'Meu candidato chama-se Lula,' tying his campaign to the popular president.

Points to NO

A large share of voters remain undecided, creating late uncertainty.
Datafolha poll published September 11, 2026 reported 40% undecided in the spontaneous question.

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