Donald TrumpFlavio BolsonaroLuiz Inacio Lula da SilvaGeorg NagelJair BolsonaroPer SvenningssonPeter HegemannKarl DeisserothNobel Committee for Physiology or MedicineHoward Hughes Medical InstituteUniversity of WürzburgStanford UniversityWorkers' Party (PT)Humboldt University of BerlinLiberal Party (PL)

Flávio Bolsonaro wins first round of Brazil presidential election; analysis says he was favourite to win

Flávio Bolsonaro, the right-wing Brazilian senator, has emerged as the frontrunner in the first round of the presidential election, securing 47% of the vote against incumbent President Luiz Inácio Lula da Silva's 45.1%, setting the stage for a runoff later this month.

The Guardian The Guardian+1 source5 October 2026 · 13:13 UTC
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Flávio Bolsonaro's unexpected lead in Brazil's presidential election first round has raised hopes for his campaign and the country's financial markets.12

"Unless something very unusual happens in the next three weeks, Flavio Bolsonaro is set to win," said political analyst Stuenkel.

Bolsonaro's performance, which surpassed expectations, positions him favorably for the runoff, especially as 21% of the electorate, or about 30 million Brazilians, did not vote in the first round.

Lula, who has been on a collision course with U.S. President Donald Trump, must now adapt his campaign strategy to mobilize voters who abstained.

“In Brazilian presidential politics, no candidate who came second in the first round ended up winning the presidency since 1989,” Stuenkel noted.

Bolsonaro's Liberal Party also made significant gains in Congress, winning 121 of the 513 seats in the Chamber of Deputies, compared to Lula's 70 seats.

The election results have implications for Brazil's economic landscape, with the currency and stock market responding positively to Bolsonaro's candidacy.

“So he must change his campaign tactics and above all mobilise a significant part of people who stayed at home,” Stuenkel added, emphasizing the need for Lula to engage the electorate effectively.

Key Insight
“The first-round result sets up a runoff, with Bolsonaro's lead reflecting broader voter sentiment ahead of the second round. The analysis highlights key issues that shaped the vote, including economic concerns and public safety.”
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CuriousCats studied:
1
The GuardianThe Guardian
“5 October 2026 has decided to award the 2026 Nobel Prize in Physiology or Medicine jointly to: KARL DEISSEROTHThe Howard Hughes Medical Institute and Stanford University, USA PETER HEGEMANNHumboldt University of Berlin, Germany GEORG NAGELUniversity of Würzburg, Germany *“for their discoveries concerning light-gated ion channels and optogenetics”*”
The Guardian →
2
Al JazeeraAl Jazeera
“Right-wing Brazilian Senator Flavio Bolsonaro has exceeded expectations in the first-round vote with a slight lead over the incumbent left-wing President Luiz Inacio ‌Lula da Silva, triggering a run-off later this month.”
Al Jazeera →
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