Nearly a quarter of voters remained genuinely undecided or uncommitted
A week before Peru's presidential runoff, the country found itself suspended at a crossroads between two sharply different visions of its future. Pedro Castillo, the leftist schoolteacher from the highlands, and Keiko Fujimori, heir to a polarizing political dynasty, stood within two percentage points of each other — a margin so thin it dissolved into statistical uncertainty. What had once looked like a comfortable Castillo lead had narrowed dramatically, and the quarter of the electorate still uncommitted carried the weight of a nation's direction in their hands.
- In just seven days, Castillo shed more than four points while Fujimori gained nearly four — a momentum reversal that transformed a comfortable lead into a dead heat.
- With a margin of error of 2.8 points, the poll cannot reliably separate the two candidates, leaving the outcome genuinely unknowable one week out.
- More than 21% of voters remain undecided, plan to abstain, or intend to cast blank or null ballots — a restless bloc larger than the gap between the two candidates.
- Fujimori's anti-vote stands at 43%, meaning nearly half the country has already decided they will not support her regardless of what the final week brings.
- Peru heads into its final days of campaigning not with clarity, but with two candidates locked in a contest where the disenchanted middle may prove more decisive than either base.
Seven days before Peru's runoff election, the race had collapsed into a statistical tie. Pedro Castillo of Perú Libre held 40.3 percent support in the latest IEP poll, with Keiko Fujimori of Fuerza Popular just two points behind at 38.3 — a gap well within the survey's 2.8-point margin of error.
The shift had been swift and striking. One week prior, Castillo led 44.8 to 34.4. In a matter of days, he had lost more than four points while Fujimori gained nearly the same. The poll, conducted May 27 and 28 across 24 departments with 1,227 respondents, captured a race in motion — and the direction of that motion had changed.
Deepening the uncertainty was a restless quarter of the electorate that refused to commit. Some 6.3 percent remained undecided, 2 percent rejected both candidates outright, and 13 percent planned to cast blank or null ballots. Together, these voters represented more than 21 percent of the electorate — a bloc capable of deciding the presidency.
Fujimori's climb came shadowed by a stubborn reality: 43 percent of voters said they would not support her under any circumstances, reflecting a polarization that her rising numbers could not fully obscure. Castillo, while facing no comparable ceiling of rejection, had shown his support was softer than it once appeared.
With one week remaining, Peru stood genuinely divided — between redistribution and market orthodoxy, between a rural schoolteacher and a political dynasty — while the undecided and the disenchanted held the balance.
Seven days before Peru would choose its next president, the race had tightened into something close to a dead heat. Pedro Castillo, the leftist candidate from Perú Libre, held 40.3 percent support according to the latest Instituto de Estudios Peruanos poll. Keiko Fujimori, representing the right-wing Fuerza Popular, trailed by just two percentage points at 38.3 percent. In statistical terms, the gap had collapsed into what pollsters call a technical tie—a margin so narrow that sampling error could erase it entirely.
The shift had been dramatic. A week earlier, Castillo had commanded 44.8 percent while Fujimori managed only 34.4 percent. In seven days, he had lost more than four points. She had gained nearly four. The momentum, unmistakably, had swung. The IEP survey, conducted May 27 and 28 among 1,227 respondents across 24 departments, carried a margin of error of 2.8 points in either direction—meaning the true numbers could move the race even further in either direction.
But the uncertainty extended beyond polling margins. Nearly a quarter of the electorate remained genuinely undecided or uncommitted. The poll found that 6.3 percent of voters had not yet settled on a candidate. Another 2 percent said they would support neither. Thirteen percent planned to cast blank or null votes—a protest vote, a refusal to choose, a statement of dissatisfaction with both options. Together, these groups represented more than 21 percent of the electorate, a bloc large enough to determine the outcome.
Fujimori carried a particular burden heading into the final week. While her support had climbed, so had the intensity of opposition to her. Forty-three percent of voters said they would not support her under any circumstances—a rejection rate that spoke to deep polarization. She remained the candidate more Peruvians actively opposed than actively backed. Castillo, by contrast, faced no comparable anti-vote ceiling, though his recent decline suggested his own support was softer than it had appeared.
The race had become a contest between two visions of Peru's future, and the country appeared genuinely divided. The left, represented by Castillo and his party's promise of redistribution and state intervention, had mobilized significant support. The right, embodied in Fujimori's family legacy and market-oriented platform, retained its own base. But the middle—the undecided, the protest voters, those still weighing their choice—held the election in their hands. In the final week before the runoff, Peru remained suspended between two futures, with neither candidate able to claim momentum or certainty.
Citações Notáveis
The difference between both candidates represents a technical tie— Instituto de Estudios Peruanos poll
A Conversa do Hearth Outra perspectiva sobre a história
How much did Castillo's support actually drop in that single week?
He went from 44.8 percent down to 40.3 percent. That's more than four points in seven days. For a candidate who'd already won the first round, that's a significant erosion.
And Fujimori gained ground at the same time?
She climbed from 34.4 to 38.3 percent. So while he was losing, she was gaining—the movement was happening in both directions simultaneously.
What does a technical tie actually mean in this context?
It means the two-point gap between them falls within the margin of error. Statistically, you can't say with confidence who's actually ahead. Either could be leading in reality.
But there's this large group of undecided voters—over 21 percent. Doesn't that make the whole poll almost meaningless?
Not meaningless, but it does mean the election is genuinely open. More than one in five voters hadn't made up their minds or were planning protest votes. That's a huge variable.
What struck you most about the numbers?
The anti-Fujimori vote. Forty-three percent said they wouldn't support her no matter what. That's a ceiling on her support that Castillo doesn't face. She could win, but she'd be doing it against active opposition from nearly half the country.
So what was the real story of that week?
Momentum had shifted, but the race remained genuinely uncertain. Castillo was slipping, Fujimori was rising, and a huge chunk of Peru still hadn't decided. It was wide open.