Colombians head to the polls today in a presidential run-off shadowed by allegations of vote coercion, foreign interference and a culture war fought largely on social media, with right-wing candidate Abelardo de la Espriella facing leftist senator Iván Cepeda after a campaign in which polls diverged sharply.

Three surveys — by Guarumo, AtlasIntel and CNC — gave De la Espriella leads of between 3.9 and 7.7 percentage points. Celag Data showed Cepeda narrowly ahead, within the margin of error. Prediction markets aggregating post-first-round surveys, however, placed Cepeda as overall favourite by around 10 points, in yet another sign of uncertainty heading into polling day.

The most internationally resonant controversy erupted on June 17, when US immigration agents detained Colombian activist Franklin Humberto Coral Garrido, known online as Beto Coral, at his home in Phoenix, Arizona, the same day Secretary of State Marco Rubio signed a memorandum determining he was deportable. According to the New York Times, Rubio's memo stated Coral had "used his presence in the United States to conduct political activity in support of the Petro government" and had campaigned against a presidential candidate. Coral had recently protested against De la Espriella in Miami. President Gustavo Petro — who is constitutionally barred from seeking re-election — called the detention "political persecution," and Colombia's foreign ministry lodged a formal diplomatic protest.

De la Espriella, for his part, posted on X the same day: "good news for patriotic Colombians abroad — coming soon."

The foreign interference row widened on June 17, when Argentine President Javier Milei threw his weight behind De la Espriella, writing on X that he and the candidate had spoken by phone and agreed "this is Colombia's moment." Bogotá filed a second diplomatic protest, calling the remarks "inadmissible" and an improper intervention in a matter that "belongs exclusively to the Colombian people."

Domestically, Revista Raya's investigative unit reported that contractors in Cartagena alleged they were pressured to back De la Espriella under threat of losing their contracts; one source said simply that failing to comply would cost them renewal. Volcánicas separately reported allegations that fashion entrepreneur Arturo Calle had coerced employees' votes, claims neither side had confirmed nor denied at the time of writing. Revista Raya also reported that a De la Espriella campaign coordinator in Huila was recorded threatening to "take down" both Petro and Cepeda.

The cultural battle played out just as fiercely online. DW documented Colombian K-pop fan communities mobilising digitally for Cepeda, while satirist Alejandro Riaño and comedian Yeferson Cossio backed the senator publicly, as did former Bogotá mayor Claudia López, who on June 17 called Cepeda "decent" and De la Espriella a "mafioso." Cepeda also earned the backing of 750 churches and faith communities nationwide.

Sondra Macollins, a lawyer eliminated in the first round who trained alongside De la Espriella on a postgraduate programme at Universidad Sergio Arboleda, likewise endorsed Cepeda. Of her former classmate, she told Alerta 104.4 FM: "For me, El Tigre arriving at the Casa de Nariño is like having put Garavito in charge of the ICBF," in a reference to Colombia's most notorious serial killer and child rapist.

Fandoms became a battleground in their own right. K-pop devotees, Swifties, Livies, Tinistas, Morat followers and emos organised digital brigades for Cepeda, while Antonella Petro, the president's daughter and a social-media figure with more than 300,000 followers, posted reels urging fellow fans to back the senator, asking how Bad Bunny followers could vote for a candidate she said would "minimise women's rights." Cambio noted the mobilisation echoed the youth wave that carried Petro to power in 2022. One in four registered voters is aged between 18 and 28, making turnout among the young potentially decisive.

De la Espriella has the backing of Donald Trump, Milei, former president Álvaro Uribe and uribista senator Paloma Valencia, Uribe's goddaughter and De la Espriella's chief rival in the first round. He holds a US passport, having become an American citizen in 2023.

Football, meanwhile, has threaded itself through every corner of the campaign. The run-off fell in the same week Colombia's national team was playing group matches at the World Cup in North America, a coincidence both camps sought to exploit. De la Espriella received his first-round results on May 31 wearing the yellow national shirt, wrapping himself in the flag at the moment of his breakthrough. Cepeda, sensing the same current, proposed nine days before the vote that Colombia bid to host a future World Cup, prompting opponents to point out he had once called the politicisation of football "repugnant."

A viral photo purporting to show national team players making De la Espriella's signature military salute was confirmed by El Tiempo as AI-generated, underscoring the appetite to drag the squad into a polarised race it has pointedly avoided. The jersey itself became a legal dispute: a tutela filed by citizen Wilmar Bocanegra saw a municipal court provisionally bar De la Espriella from wearing the shirt at campaign events on June 3, only for a second judge to overturn the order days later as disproportionate, ruling both candidates had equal right to it. Cepeda, who had initially questioned his rival's use of the jersey, began wearing it himself soon after. The players have stayed conspicuously silent, though local media reported that James Rodríguez appeared to decline a request from Antonella Petro for a signed shirt at the June 4 flag-handover ceremony.

That same national feeling was on display on June 17 at the Estadio Azteca in Mexico City, when Colombia beat Uzbekistan 3-1 in the Central Asian side's first-ever World Cup match. A young Uzbek boy clutching a replica trophy was seen in tears after a Colombia goal; nearby fans responded by chanting "Uzbekistán!" in a gesture of solidarity that went viral worldwide. Coach Néstor Lorenzo described a "beautiful energy" around the squad that night: a rare moment, amid a bitterly contested election, when football briefly did what politics could not.

More than 41.4mn Colombians are registered to vote. The next president takes office on August 7.