Brazil is officially headed for a high-stakes presidential runoff between center-left incumbent President Luiz Inácio “Lula” da Silva and far-right senator Flávio Bolsonaro. The electoral landscape was dramatically reshuffled after the challenger took a surprise lead in the first round of voting, finishing nearly two percentage points ahead of the sitting president.

Ahead of the weekend vote, the majority of pre-election opinion polls had consistently shown Da Silva leading the national race. However, when the final ballots were tallied, the incumbent garnered 45.1% of the vote. Meanwhile, his primary rival—Flávio Bolsonaro, the eldest son of former right-wing President Jair Bolsonaro—secured 47%. While this represented a remarkably strong showing for the challenger, it fell just short of the absolute majority required to secure an outright victory in the first round, paving the way for a decisive second-round showdown scheduled for October 25.

The political momentum shifted almost immediately following the first round. The first post-election survey released by the prominent polling agency Datafolha indicated that Bolsonaro has maintained his newly found momentum, entering the runoff period with 49% of voter intentions compared to 45% for Lula.

To break down the stunning election results and analyze what they portend for the candidates and the broader trajectory of South America’s largest democracy, three leading Brazilian political analysts spoke extensively with the Herald.

A Historic Political Surprise

“Flávio Bolsonaro’s victory in the first round was a huge surprise,” said Creomar De Souza, a prominent political analyst and the CEO and founder of the consulting firm Dharma Political Risk and Strategy.

“The prevailing belief here was that Lula would be the winner,” De Souza noted, pointing directly to the numerous surveys and forecasting models that had pointed to an outright victory or a safer lead for the incumbent leftist leader.

Yet, for other experts, the true shock lay elsewhere in the electoral data. Cláudio Couto, a political scientist and professor at the Fundação Getulio Vargas Business School, pointed out that what surprised him most was not merely that Bolsonaro came out ahead in the presidential tally, but rather the unexpected, sweeping victory achieved by his political home, the Liberal Party (PL, by its Portuguese initials), in concurrent congressional and gubernatorial elections.

The Liberal Party secured the highest number of gubernatorial races across the country, capturing outright victories in five states during the first round. That number could potentially climb to seven depending on the outcome of upcoming runoff contests in the critical states of Amazonas and Rio de Janeiro.

According to Paulo Niccoli Ramirez, a professor of political science at the Higher School of Advertising and Marketing and the São Paulo School of Sociology and Politics Foundation, Bolsonaro’s unexpected surge demonstrates the enduring strength and organizational discipline of the Bolsonarist political movement. Ramirez highlighted their sophisticated deployment of social media platforms—such as Instagram, Twitter, and Facebook—to effectively sway voter sentiment and shape public discourse.

Can Lula Turn the Election Around?

Although the numerical gap between Da Silva and Bolsonaro in the first round was less than two percentage points, the panel of analysts expressed skepticism regarding the incumbent’s ability to reverse the trend and secure victory in the runoff.

Historical precedent in modern Brazilian presidential elections weighs heavily against such a turnaround, as no runner-up in the first round of a presidential contest has ever gone on to win the subsequent runoff. Furthermore, political analysts expect that votes cast for minor right-wing candidates in the initial round will consolidate solidly behind Bolsonaro as the race narrows to two contenders.

“It is possible that Lula could make a comeback, but it’s very difficult,” Couto said. “It’s not impossible, but it’s not the most likely outcome.”

Nevertheless, the analysts concurred that Lula retains viable pathways to expand his electoral base, primarily by mobilizing the significant segment of the electorate that abstained from voting during the initial round on October 4.

“There has never been such a narrow margin between the first and the second place. And this gives Lula’s voters hope,” De Souza observed.

Official figures indicate that at least 21% of eligible Brazilian voters failed to cast a ballot in the first round. In response, Lula, his campaign apparatus, and a broad coalition of supporters—including many who are not necessarily aligned with the left but harbor deep concerns regarding a potential return of the far right to executive power—have launched an aggressive mobilization campaign. Utilizing grassroots word-of-mouth networks and widespread social media outreach, they are actively targeting abstentionists as well as citizens who cast blank or null ballots.

Ramirez emphasized that nearly 37 million Brazilians sat out the first election, a pool of uncast ballots vastly outstripping the narrow 2.3 million-vote gap that currently separates the two leading candidates.

“I get the impression that many people may vote for Lula or choose not to vote for Bolsonaro out of fear of losing social and political rights, especially since Flávio Bolsonaro has threatened to change the constitution,” Ramirez said. He added that while votes previously cast for minor conservative and right-wing candidates will likely migrate to Bolsonaro, “they don’t even reach 4 million votes combined.”

The prospect of governing under a potentially “extremely dangerous” Bolsonaro administration, De Souza suggested, “might transform Lula into a kind of popular leader embodying democratic resistance, and this could be enough for a comeback.” Even so, he reiterated that Flávio Bolsonaro remains the clear frontrunner heading into the final weeks of the campaign.

Breaking Down Bolsonaro’s Rise

Flávio Bolsonaro is the eldest son of former right-wing President Jair Bolsonaro, who governed Brazil from 2018 to 2022. The former president is currently serving a lengthy 27-year prison sentence following his conviction for plotting a coup and orchestrating an assassination plot targeting Lula in the wake of the 2022 presidential election.

At that time, Jair Bolsonaro was an active incumbent seeking a second term, only to be defeated by Lula in a deeply polarized election. The thwarted coup plot had aimed to prevent Da Silva from assuming office, though he ultimately took the oath in early 2023. Lula, who previously served two consecutive presidential terms from 2003 to 2011, is now seeking a fourth mandate. His political career faced a major interruption when he was imprisoned on corruption charges in 2018—preventing him from running in that year’s election—before those convictions were ultimately annulled.

While Flávio Bolsonaro possesses substantial political experience as a lawmaker, he had not historically operated as a dominant figure on the national political stage until this electoral cycle. Analysts attribute his sudden breakthrough to a convergence of complex factors.

For Couto, the result reflects profound underlying dissatisfaction with the current administration. Polling data indicates that roughly 40% of Brazilians currently view Da Silva’s administration negatively, fueling a potent anti-establishment sentiment that manifested decisively at the ballot box.

Bolsonarists, Couto noted, successfully positioned themselves as the true voice of the anti-establishment. Conversely, “Lula is a traditional left-wing politician, a social democrat,” and as such, “he is closely identified with the political system,” including institutional figures such as Supreme Federal Court Justice Alexandre de Moraes, who has faced recent scrutiny amid a developing corruption scandal.

De Souza argued that beyond Lula’s plateauing popularity, Bolsonaro profited from a disciplined strategic campaign designed to convince right-leaning electors to back him directly in the first round rather than scattering their votes among alternative conservative hopefuls. While Brazilian voters traditionally support minor or protest candidates in initial rounds before consolidating behind major finalists in runoffs, the conservative electorate demonstrated unprecedented discipline this cycle.

“At the end of the day, Lula didn’t lose any votes. But Flávio has gained votes from people who didn’t reveal this preference in previous polls,” De Souza explained.

A Far-Right Congress Awaits

Regardless of which candidate triumphs in the runoff, the next president will assume office in February 2027 facing a formidable legislative reality: a newly elected Congress dominated by the political right. Bolsonaro’s Liberal Party is set to hold nearly a quarter of the seats in the Chamber of Deputies while establishing itself as the single largest bloc in the Senate, commanding a full third of the upper house.

When factoring in ideological allies and allied conservative lawmakers, the PL-led bloc approaches an absolute majority in the Senate.

“This is far more than one might have imagined,” Couto remarked.

Ramirez warned that such an overwhelming legislative majority would grant a President Bolsonaro extraordinary leverage, enabling him to swiftly push through sweeping constitutional reforms grounded in a staunchly conservative worldview. He noted that this agenda features elements prioritizing evangelical values alongside policies that critics argue could marginalize religious minorities and curtail freedom of expression.

Illustrating this legislative ambition, Bolsonaro publicly announced plans to reform the national constitution, declaring that a victory would empower him to lower the criminal responsibility age from 18 to 16 and abolish the mechanism of presidential re-election.

Furthermore, Ramirez cautioned that the conservative legislative majority would facilitate deep structural overhauls, including “the reduction or elimination of public funding for science, technology, the public health system, public universities, and social security, along with a greater trend toward the privatization of countless state-owned enterprises.”

Echoes of Argentina’s Economic Path

“Flávio Bolsonaro’s victory would crown the triumph of the far right and pave the way for them to implement all the changes they desire, while the left will be in the minority in the next legislature,” Ramirez observed.

Throughout the campaign, Bolsonaro has frequently cited Argentine President Javier Milei—widely known for implementing sweeping, aggressive austerity measures aimed at drastically cutting state expenditure—as a primary ideological and economic model.

“If Argentina had a chainsaw, Brazil will have a massive cut in taxes, bureaucracy, and corruption!” Bolsonaro proclaimed in June, expressing gratitude to Milei for his regional backing. To describe his domestic equivalent to Milei’s “chainsaw” policies, Bolsonaro utilized the Portuguese expression tesouracão, invoking the imagery of aggressively shearing away state apparatuses with oversized scissors.

The stark ideological divide played out publicly on social media this week when Lula invoked the same cross-border comparison in a post on X, condemning the human and economic costs of deep budget cuts and worsening economic hardship for ordinary Argentine citizens.

“There, they promised ‘chainsaw.’ Here, it’s tesouracão. The result is always the same: against the people,” the Brazilian president wrote.

Political analysts warn that should Lula manage to pull off a historic comeback and win the October 25 runoff, he would likely confront a severe governance crisis. Ruling alongside a hostile, conservative-dominated Congress could paralyze his legislative agenda, threaten potential gridlock or ungovernability, and expose his administration to ongoing risks of legislative confrontation and impeachment proceedings.