Will Luiz Inácio Lula da Silva win the 2026 Brazilian presidential election?

- [2026-10-04] The first round was held. The TSE count is final. Flávio Bolsonaro (PL) got 47.03% (56,104,503 votes) and Lula (PT) got 45.16% (53,879,538). Augusto Cury was third with 2.89% and Renan Santos fourth with 2.24%. No one passed 50%, so a runoff is required. https://www.cartacapital.com.br/politica/tse-encerra-apuracao-do-1o-turno/ - [2026-10-04] Polls had projected Lula ahead by about 3 points in the first round, so he underperformed them. Analysts called Flávio the favourite for the runoff. https://www.americasquarterly.org/article/reaction-flavio-bolsonaro-and-lula-advance-to-brazils-presidential-runoff/ - [2026-10-04] Bolsonaro's PL won 121 of 513 Chamber seats and its Senate bloc grew from 9 to 28 of 81. It also won five governorships, including Rio de Janeiro. Only about 8% of votes went to candidates other than the top two. A Quaest poll from September found over a quarter of those voters would abstain or spoil their ballot in a runoff. https://www.as-coa.org/articles/brazils-election-four-points-understand-first-round-results - [2026-10-09] The first Datafolha runoff poll (fieldwork 6–7 Oct) had Flávio at 52% and Lula at 48% of valid votes. Most MDB state branches were reported due to back Flávio. https://www.riotimesonline.com/brazil-datafolha-runoff-poll-flavio-lula-2026/ - [2026-10-14] The first Quaest runoff poll (fieldwork 10–13 Oct) had Flávio 51% and Lula 49% of valid votes. Raw numbers were 46% to 44%. https://www.opovo.com.br/noticias/politica/eleicoes/2026/10/14/datafolha-e-quaest-divulgam-novas-pesquisas-sobre-2-turno-entre-lula-e-flavio.html - [2026-10-15] The second Datafolha poll (fieldwork 13–14 Oct) had Flávio 47% and Lula 45% on raw numbers. His lead narrowed from 4 points to 2. The margin of error is ±2 points. https://www.aovivodebrasilia.com.br/pesquisas-2o-turno-flavio-bolsonaro-lula-2026/ - [2026-10-16] CNT/MDA had Flávio at 46.8% and Lula at 45.9%. Al Jazeera, citing Reuters, said all three recent polls fall within the margin of error and many experts still call the race a toss-up. https://www.aljazeera.com/news/2026/10/16/latest-poll-shows-bolsonaro-maintaining-edge-over-lula-in-brazil-run-off - [2026-10-14] Congress approved a constitutional amendment giving workers two paid days off a week. This is a flagship Lula promise, delivered days before the vote. https://www.aljazeera.com/news/2026/10/16/latest-poll-shows-bolsonaro-maintaining-edge-over-lula-in-brazil-run-off - [2026-10-17] Rio Times tracker, from 8–17 Oct: Flávio leads in 16 of 18 national runoff polls. The unweighted average of 12 pollsters' latest polls is Flávio 51.2%, Lula 48.8% of valid votes. The range runs from Lula +1.8 to Flávio +10. https://www.riotimesonline.com/brazil-runoff-polls-2026/ - [2026-10-17/18] Recent outliers or near-ties: Veritá (17 Oct) had Flávio 51.1% to 48.9%. Ipespe/Abrapel had Flávio 51.2% to 48.8%. Vox Brasil had Lula 51% to 49%. Ipespe found Caiado voters going 59% to Flávio and 18% to Lula. https://www.riotimesonline.com/brazil-election-results-2026/ - [2026-10-18] Other venues, as reported by Rio Times (not this contract): Polymarket has Flávio at about 81% and Lula at about 19–20%. Kalshi has Flávio at 79% and Lula at 21%. Earlier, on 9 Oct, Polymarket had Flávio at 85.8%. https://www.riotimesonline.com/brazil-vox-brasil-poll-lula-51-flavio-49-runoff-2026 - [2026-10-25] The runoff is scheduled for 25 October. Polls open 7am–4pm Brasília time (the Rio Times lists the count from 5pm Brasília). The TSE totals the vote the same night, as it did on 4–5 Oct. The TSE president is Kassio Nunes Marques. https://www.tse.jus.br/comunicacao/noticias/2026/Outubro/presidente-do-tse-conclui-1o-turno-das-eleicoes-2026-e-projeta-mesma-tranquilidade-para-segunda-fase-do-pleito BOTTOM LINE: The race goes to a runoff one week from today. Lula trails Flávio Bolsonaro by about 2 points in most polls, though the gap narrowed in mid-October and the Datafolha, Quaest and CNT/MDA polls are within the margin of error. First-round pollsters underestimated the right, so the polls may understate Flávio. The outcome should be known on the night of 25 October. NOT FOUND: I found no TSE runoff result, because the vote hasn't happened yet. I didn't find an AtlasIntel runoff figure or the PoderData and Nexus figures individually. I didn't find any court challenge that could change the candidate list, or any official Lula or Flávio campaign event schedule or debate dates for the final week.

- [2026-10-04] Brazil's first round gave Flávio Bolsonaro (PL) 47.03% of valid votes and Lula 45.16%. Neither passed 50%, so a runoff is set for 2026-10-25. https://en.wikipedia.org/wiki/2026_Brazilian_general_election - [2026-10-05] Polls had Lula about 3 points ahead before round one, and Flávio beat them. Last-week Datafolha had Lula 40, Flávio 36. Analyst Oliver Stuenkel says no second-place first-round finisher has won the presidency since 1989. Other candidates took about 8%, mostly centre-right. https://www.aljazeera.com/news/2026/10/5/bolsonaro-favourite-to-win-what-brazils-first-round-of-election-tells-us - [2026-10-05] Lula's first-round vote fell 3.3 points from his 2022 first round, and Flávio ran 3.8 points above his father's 2022 first-round share. Per the Americas Society/Council of the Americas (AS/COA), this was Lula's first first-round defeat since 1998. Lula would need about six in ten of the votes that went to eliminated candidates. https://www.as-coa.org/articles/brazils-election-four-points-understand-first-round-results - [2022-10-02] Historical polling miss: the final 2022 Datafolha and Ipec polls had Lula at 50–51% and Bolsonaro near 36–37%. The actual result was Lula 48.4% and Bolsonaro 43.2%, so polls understated the right by 6–7 points. Lula went on to win the 2022 runoff 50.9–49.1. https://agencialupa.substack.com/p/13513308_lente-nas-elei-es-11 - [2026-10-14] Quaest's first runoff poll (fieldwork 10–13 Oct, n=2,154, ±2) had Flávio 46%, Lula 44%. That is 51–49 in valid votes. Rejection was Flávio 54% and Lula 53%. Among Caiado voters, 42% back Flávio and 23% Lula. https://tvtnews.com.br/primeira-pesquisa-quaest-presidente-2-turn14-10/ - [2026-10-15] Datafolha's second runoff poll also had Flávio 51%, Lula 49% in valid votes. https://www.opovo.com.br/noticias/politica/eleicoes/2026/10/14/datafolha-e-quaest-divulgam-novas-pesquisas-sobre-2-turno-entre-lula-e-flavio.html - [2026-10-18] The Rio Times' simple average of the latest runoff poll from twelve pollsters (8–17 Oct) is Flávio 51.2%, Lula 48.8%. Ten of twelve put Flávio ahead, PoderData has a 50–50 tie, and Vox Brasil has Lula 51–49. Fourteen of sixteen post-round-one runoff polls favour Flávio, though several leads sit inside the margin of error. https://www.riotimesonline.com/brazil-runoff-october-25-2026-flavio-bolsonaro-lula/ - [2026-10-18] Other venues' prices, which may be stale: the Rio Times reports Polymarket and Kalshi both at about 80% for Flávio, about 20% for Lula, as of that day. Polymarket was at 86% for Flávio on 5 Oct, so his price has drifted down since round one. https://www.riotimesonline.com/brazil-runoff-october-25-2026-flavio-bolsonaro-lula/ - [2026-09-25] Pre-first-round Datafolha had Lula 47, Flávio 45 in a simulated runoff, which proved too favourable to Lula given the first-round miss. https://www.aljazeera.com/news/2026/09/25/brazils-lula-and-flavio-bolsonaro-still-essentially-tied-in-new-poll - [2026-10-05] Reference class, first-round leader in a two-candidate Brazilian runoff: Wikipedia and Al Jazeera's Stuenkel cite no come-from-behind winner since 1989, but the sample is small. Counterexample on margin: in 2022 Lula won the runoff by 1.8 points after leading round one by about 5. Tendências' Alessandra Ribeiro (quoted by Americas Quarterly) read Flávio's lead as pointing to a high probability of a runoff win. https://www.americasquarterly.org/article/reaction-flavio-bolsonaro-and-lula-advance-to-brazils-presidential-runoff/ - [2026-10-18] Turnout and abstention are swing factors. About 33.5 million did not vote in round one and about 6 million cast blank or null ballots. Quaest finds 43% of those who abstained or voted blank/null in round one now declare for Lula. https://www.as-coa.org/articles/brazils-election-four-points-understand-first-round-results BOTTOM LINE: Every outside-view indicator favours Flávio. He led round one, polls average about 51–49 for him, and the second-place first-round finisher has not won since 1989. Markets price Lula near 20%. The race is still within poll error, and polls have previously understated the right and may now overcorrect, so Lula's chance is real but below even. NOT FOUND: Track-record statistics for the 2026 pollsters beyond the round-one miss. Any official runoff result, which is still seven days away. Independent expert probability models, such as academic forecasts or The Economist.

YES means: Lula wins the 25 October 2026 runoff against Flávio Bolsonaro and is declared the winner of the 2026 Brazilian presidential election. - [2026-10-18] **Most likely path to YES: a turnout-led comeback.** Lula needs a turnout surge among first-round abstainers and a poll miss in his favour. Quaest (14 Oct) found 43% of people who abstained or cast blank or null ballots in round one say they will vote Lula, against 38% for Flávio. About 33 million people did not vote in round one, and Flávio's lead was about 2.2 million votes. https://www.bemparana.com.br/eleicoes-2026/lula-e-flavio-bolsonaro-entram-na-reta-final-com-temor-de-abstencao-no-segundo-turno/ - [2026-10-17] **PT is running a targeted turnout operation.** Local vote targets went to elected and defeated candidates. Allied Northeast governors are keeping free public transport running on election day. The campaign is also stressing that the runoff ballot is quicker than round one. Camilo Santana (PT) said participation will rise. PT is especially worried about elderly voters, who back Lula but abstain more. https://www.bemparana.com.br/eleicoes-2026/lula-e-flavio-bolsonaro-entram-na-reta-final-com-temor-de-abstencao-no-segundo-turno/ - [2026-10-17] **Structural turnout asymmetry.** São Paulo, Minas Gerais and Rio de Janeiro have no governor runoff, and all three favoured Flávio in round one. The PL itself worries that non-Bolsonarista voters there won't turn out just for Flávio. Only six states have a governor runoff, so campaign machinery is thinner on both sides. https://www.bemparana.com.br/eleicoes-2026/lula-e-flavio-bolsonaro-entram-na-reta-final-com-temor-de-abstencao-no-segundo-turno/ - [2026-10-17] **Street and social-media mobilisation may not be in the polls yet.** Lula's team expects polls to start reflecting the recent street rallies. Also on Lula's side: Congress passed an end to the 6x1 work schedule and expanded MEI (micro-entrepreneur) debt relief, and Lula is campaigning on both. Flávio's camp saw its early optimism shaken by the pro-Lula mobilisation. https://www.bemparana.com.br/eleicoes-2026/lula-e-flavio-bolsonaro-entram-na-reta-final-com-temor-de-abstencao-no-segundo-turno/ - [2026-10-18] **The latest poll is Lula's best number so far.** Vox Brasil, published 18 Oct, has Lula at 51% to Flávio's 49% of valid votes. It is the only poll in Poder360's 13-poll tally that puts Lula ahead. In the same tally, Futura (16 Oct) has Flávio at only 50.8%, a 1.6-point lead. https://www.poder360.com.br/poder-eleicoes-2026/saiba-como-estao-lula-e-flavio-nas-pesquisas-a-7-dias-do-2o-turno/ - [2026-10-03] **AtlasIntel's own pre-round-one runoff poll had Lula slightly ahead.** The final pre-round-one AtlasIntel poll (fieldwork 27 Sep–2 Oct, n=4,945) had Lula 50.1–49.9. AtlasIntel then moved to Flávio 52.8–47.2 on 9 Oct (fieldwork 3–8 Oct, n=5,026). That is a 5.6-point swing in a week, so single polls are volatile. AtlasIntel has a new poll due 19 Oct. https://www.metropoles.com/brasil/atlasintel-flavio-tem-528-e-lula-472-no-2o-turno-em-votos-validos - [2026-10-14] **Voters on the issues Lula owns are not decisive for Flávio.** In AtlasIntel (9 Oct), the two candidates were tied on poverty/inequality and on environment. Flávio led by about 10 points on crime and on fiscal control. If the debates shift focus to cost of living, that is Lula's ground. https://www.metropoles.com/brasil/atlasintel-flavio-tem-528-e-lula-472-no-2o-turno-em-votos-validos - [2026-10-14] **Rejection is level.** Quaest found Flávio's rejection at 54% and Lula's at 53%, so Flávio has no rejection advantage. 91% of voters say their vote is final and 9% could still change. That is a small pool, but it exceeds the poll margin. https://www.infomoney.com.br/politica/quaest-2-turno-flavio-lula/ - [2026-10-18] **Three debates in the final week gave Lula a chance to shift undecided voters.** One was 15 Oct (pool), one 18 Oct (Band, 8pm Brasília) and one 23 Oct (TV Globo). They were the first direct encounters of the campaign, since both candidates skipped first-round debates. PT strategists see this as potentially decisive for undecided voters. https://www.businessday.co.za/world/americas/2026-10-18-lula-and-bolsonaro-set-for-first-debate-ahead-of-brazil-runoff-vote/ - [2026-10-05] **Precedent for Lula winning a runoff after a first-round shock.** In 2006 he took 48.7% in round one against Alckmin's 41.6%, which was short of expectations. He then won the runoff 60.8–39.2, and Alckmin's share fell below his round-one vote. In 2022 abstention fell between rounds, which helped Lula's narrow win. Wikipedia: https://en.wikipedia.org/wiki/2006_Brazilian_general_election; https://www.latintimes.com/flavio-bolsonaro-leads-lula-33-million-brazilians-who-didnt-vote-may-have-final-word-599834 - [2026-10-18] **The margin is within normal poll error.** The Poder360 tally puts leads at 1.6 to 6 points. Quaest and Datafolha raw leads are 2 points, inside their ±2 margin. The first-round pollster miss (Lula was overestimated by about 3 points) could in principle be overcorrected. Flávio needs only to hold about 51%, and the Caiado voters (59% to Flávio in Ipespe) are the largest transfer block. This is the main gap Lula would have to close. https://www.poder360.com.br/poder-eleicoes-2026/leia-como-estao-lula-e-flavio-nas-pesquisas-a-8-dias-do-2o-turno/ BOTTOM LINE: Lula's path is narrow but concrete. It needs higher turnout among Northeast and low-income abstainers, who lean Lula 43–38, plus a modest poll overstatement of Flávio. Vox Brasil and Futura show the race inside the margin, and the 2022 and 2006 precedents show Lula can gain between rounds. Most polls still have Flávio ahead, and he leads the first-round vote count. NOT FOUND: The AtlasIntel poll due 19 Oct, and any debate-reaction poll. Vox Brasil's own page (I only have it via Poder360 snippets, and the Poder360 and Bem Paraná pages were blocked for direct fetch, so Bem Paraná was read via the browser and Poder360 via search snippets). Any expert forecast model favouring Lula. Evidence that first-round pollster errors will reverse in the runoff.

YES means: Lula wins the 2026 Brazilian presidential election. Under the rules, that means he wins the 25 Oct 2026 runoff against Flávio Bolsonaro. - [2026-10-09] The AtlasIntel/Bloomberg runoff poll (fieldwork 3–8 Oct, n≈5,026, ±1) had Flávio at 51.1% and Lula at 45.7% of total votes. That is 52.8–47.2 in valid votes. Evangelicals favoured Flávio 72.7% to 23.5%. Voters trusted him more on fiscal balance (52–42) and crime (53–43). This is the pollster that had Lula ahead before round one. AtlasIntel's next runoff poll comes out on 19 Oct (5,000 interviews, ±1). https://exame.com/brasil/pesquisa-atlasintel-2o-turno-flavio-bolsonaro-abre-54-pontos-de-vantagem-sobre-lula/ and https://www.cartacapital.com.br/cartaexpressa/a-nova-pesquisa-atlasintel-sobre-lula-x-flavio-bolsonaro-a-6-dias-do-2o-turno/ - [2026-10-15] Poder360's tracker (about 8 days out) shows Flávio numerically ahead in 11 of 13 recent national studies, and Lula ahead in only 1. AtlasIntel, Ipespe/Abrapel (52.7–47.3) and DataTrends (53.1–46.9) all show Flávio ahead. Vox Brasil is the lone Lula lead, at 50.86%. Several of these polls are more favourable to Flávio than the averages quoted earlier. https://poder360.com.br/poder-eleicoes-2026/leia-como-estao-lula-e-flavio-nas-pesquisas-a-8-dias-do-2o-turno - [2026-10-14] Quaest transfer data (fetched) shows the arithmetic Lula faces. About 40% of Renan Santos voters back Flávio, versus 14% for Lula. Caiado voters split 42% to 23%. Only Cury voters lean to Lula (34% to 30%), and Cury himself endorsed Flávio. Renan Santos says he won't vote and won't endorse anyone. The PSD left its state branches free to choose. Lula's one clear gain is among first-round abstainers and blank or null voters, who go 43–38 to him, and that depends on turnout. https://www.infomoney.com.br/politica/quaest-transferencia-de-votos-lula-flavio/ and https://agenciabrasil.ebc.com.br/politica/noticia/2026-10/renan-descarta-apoio-no-2o-turno-psd-de-caiado-libera-bases-estaduais - [2026-10-04] Renan Santos and Caiado together got 5.2 million votes. That is more than double Flávio's 2.22 million-vote first-round lead over Lula. Lula therefore has to win the leftover vote by a wide margin, or Flávio's lead simply holds. https://agenciabrasil.ebc.com.br/politica/noticia/2026-10/renan-descarta-apoio-no-2o-turno-psd-de-caiado-libera-bases-estaduais - [2026-10-14] Quaest also found that 91% of respondents call their choice definitive. That leaves few persuadable voters in the last 11 days. Both candidates' rejection is high, with Flávio at 54% and Lula at 53%. Lula's mid-October narrowing in Datafolha is a movement of one point per candidate. That is within noise, and the Oct 14 and 15 polls leave him behind. https://www.infomoney.com.br/politica/quaest-transferencia-de-votos-lula-flavio/ and https://www.riotimesonline.com/brazil-runoff-poll-race-tightens-2026/ - [2026-10-17] Datafolha found unaligned voters favour Flávio 59–41. Datafolha also has him 10 points ahead in the Southeast, which holds 40% of the electorate. That region is also where Lula needs to hold his ground. https://www.riotimesonline.com/brazil-runoff-october-25-2026-flavio-bolsonaro-lula/ and https://colombiaone.com/2026/10/16/brazil-presidential-runoff-lula-and-flavio-bolsonaro-polls/ - [2026-10-04] The first-round polling miss ran against Lula. AtlasIntel's last poll had Lula 47.0 and Flávio 44.1 in valid votes. The result was Flávio 47.03 and Lula 45.16, a swing of about 4.7 points in the margin. Lula's final pre-election simulations of a runoff were tied or slightly ahead, so every pre-vote Lula lead was too favourable to him. If the same bias carries into the runoff, the 51–49 polls understate Flávio. https://www.gazetadopovo.com.br/eleicoes/2026/pesquisa-eleitoral-2026/atlasintel-presidente-outubro-2026-segundo-turno/ and https://www.metropoles.com/brasil/atlasintel-lula-marca-501-contra-499-de-flavio-bolsonaro-em-2o-turno - [2026-10-04] The down-ballot results show an underlying right-leaning electorate. The Oct 4 results gave the PL a much larger bloc in Congress. In some Senate and governor races, Bolsonaro-aligned candidates beat polls by wide margins (reported for 2022 by Mais Retorno; the 2026 pattern is similar). Lula would need a split-ticket swing that the first round did not show. https://maisretorno.com/portal/por-que-os-institutos-de-pesquisa-derraparam-no-1o-turno-das-eleicoes - [2026-10-15] The 6×1 work-week vote was a Lula campaign push. Lula pressed Flávio to vote for ending the 6×1 schedule. This did not visibly shift polls in the following days, since the 51–49 Quaest and Datafolha readings and PoderData's tie followed it. Also, Prerrogativas (a pro-Lula jurists' group) complained of TSE rulings favouring Flávio, a sign the campaign sees the electoral court environment as adverse. https://www.cartacapital.com.br/cartaexpressa/a-nova-pesquisa-atlasintel-sobre-lula-x-flavio-bolsonaro-a-6-dias-do-2o-turno/ and https://www.gazetadopovo.com.br/eleicoes/2026/pesquisa-eleitoral-2026/atlasintel-presidente-outubro-2026-segundo-turno/ - [2026-10-18] Resolution technicalities favour a clean NO. The question resolves YES only if Lula wins, with no tie rule and no other path. A Flávio win, or any other outcome, resolves NO. The election date is 25 Oct, the market closes 25 Oct 2027, and a TSE result is expected that night. A Lula win would need to be certified by the TSE, but a contested result is unlikely to change the answer. A Lula loss ends the question within a week. https://www.riotimesonline.com/brazil-runoff-october-25-2026-flavio-bolsonaro-lula/ - [2026-10-14] Debates are still expected in the final week: the Band debate was confirmed after Flávio backed down and agreed to attend once Lula confirmed. Debates seldom move a locked-in electorate; in 2022 the final Globo debate was judged not to have shaken a stable race. https://www.cartacapital.com.br/cartaexpressa/a-nova-pesquisa-atlasintel-sobre-lula-x-flavio-bolsonaro-a-6-dias-do-2o-turno/ and https://www.aljazeera.com/news/2022/10/29/bolsonaro-and-lula-trade-blows-in-final-brazil-election-debate BOTTOM LINE: Every structural fact favours Flávio. He led round one, the transfers from eliminated candidates favour him, polls have misses that ran against Lula, and the electorate is already largely decided. For Lula to win, he needs a poll error in his favour, higher turnout among former abstainers, or a late shift that the 11–13 point margin of preference data does not yet show. NOT FOUND: The AtlasIntel poll due 19 Oct, so no late-week reading. The exact date and time of the Band and Globo runoff debates. Any court challenge that would change the ballot. Any independent probability model. The Poder360 page returned 403 on a full fetch, so its figures come from the search snippet.