Full Breakdown
Lula and Flavio Bolsonaro Locked in Tight Race Ahead of Brazil’s October Election
By Drooid · · How we work
Core Event
Two recent opinion polls show a narrow contest between incumbent President Luiz Inácio Lula da Silva and Senator Flávio Bolsonaro, the eldest son of former President Jair Bolsonaro. In a simulated runoff, the Datafolha poll released on September 11 gives Lula a 46 % share against Flávio’s 44 %, while an AtlasIntel/Bloomberg poll released on September 4 shows Flávio slightly ahead with 46.4 % to Lula’s 46.2 %. Both surveys indicate that no candidate has yet secured the 50 % threshold required to avoid a second round.
Background & Context
Brazil’s presidential election follows a two-round system. If no contender obtains more than half of the valid votes in the first round, the top two candidates advance to a runoff. This format has been used in every election since 2002. The first round is scheduled for October 4, with a potential runoff on October 25 if needed.
Data & Statistics
- Datafolha poll (2,002 respondents surveyed September 8-10; margin of error ±2 percentage points)
- Runoff: Lula 46 %, Flávio 44 %
- First-round scenario: Lula 39 %, Flávio 35 %, Augusto Cury 6 %, Ronaldo Caiado 4 %
- AtlasIntel/Bloomberg poll (5,000 respondents surveyed September 4-9; margin of error ±1 percentage point)
- Runoff: Flávio 46.4 %, Lula 46.2 %
- First-round scenario: Lula 43.0 %, Flávio 37.4 %, Augusto Cury 6.6 %, Renan Santos 6.5 %
- Earlier August figures from the same poll had Lula 47.1 % and Flávio 42.6 % in a first-round projection.
Conflicting Reports & Gaps
The two polls differ on the runoff lead: Datafolha places Lula ahead by two points, whereas AtlasIntel/Bloomberg shows Flávio ahead by a narrow 0.2-point margin. Both surveys employ different sample sizes and margins of error, which may account for the variation. Neither source provides information on voter turnout expectations or regional breakdowns, leaving gaps in understanding how demographic factors could influence the final outcome.
What’s Next
If the first-round vote on October 4 fails to produce a majority winner, the election will move to a runoff on October 25 between the two leading candidates. Both polls suggest a highly competitive second round, making the upcoming weeks critical for campaign strategies and voter mobilization.
