G11 hour agoPolitics1 min readBrazil

Quaest survey shows percentage of undecided voters for the Senate in 2026

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A spontaneous survey by Quaest reveals that a significant portion of voters are undecided for the 2026 senatorial elections, as they were unable to name any candidate.
The survey, commissioned by Globo, interviewed 1,506 people aged 16 or over between September 25th and 28th, with a margin of error of three percentage points and a confidence level of 95%.
Each voter must vote for two different senators per state and Federal District, to renew 54 of the 81 seats.

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Why It Matters

In 2026, two senators will be elected in each state and in the Federal District, to renew 54 of the 81 seats in the Federal Senate. Each voter must vote for two different candidates, and it is not permitted to choose the same name twice.

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In 2026, two senators will be elected in each state and in the Federal District, to renew 54 of the 81 seats. Therefore, each voter must vote for two different candidates. You cannot choose the same name twice.

In Quaest's spontaneous survey, in which the names of the candidates are not shown to the voters interviewed, % are undecided because they were unable to name a candidate.

The results of the survey for the Senate consider the mentions for the first and second vacancies in a total that adds up to 100% of voting intentions and maintains the proportion between candidates, blanks/nulls and undecided candidates.

The survey was commissioned by Globo and interviewed 1,506 voters aged 16 or over between the 25th and 28th of September. The margin of error is three percentage points, plus or minus. The confidence level is 95%. The survey was registered with the Electoral Court under number MG-02019/2026.

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