How Petro Killed the Left

Dear all,

We welcome you to the Greater Caribbean Monitor (GCaM).

Last week, we told you that the markets are barely wrong. And so it was, even beyond our expectations. Cepeda lost the first round against Abelardo de la Espriella, who was able to get victories in key battlegrounds like Antioquia, where the votes from the right were presumed to be divided. After all, it is Paloma Valencia's home territory. And while Valencia did well, de la Espriella still won there. But Cepeda and the left were essentially deleted from the electoral map. More important is the fact that the left, while they were able to retain almost all the territories where Petro won, did it with fewer votes in each one of them. What that tells us is that the Colombian left reached its peak back in 2022, which will be a death sentence towards the runoff. Polymarket now places the odds of de la Espriella winning around 83%. Petro killed the left.

Our eyes are going to be on Peru this weekend, and we will surely analyze what happens there next week. The runoff is this Sunday, and, while Keiko Fujimori has good odds of winning, the radical left is breathing down her neck. The risks of the left winning are crucial for Perú. This Sunday holds the future of governability in its hands, and it could be a make-or-break point for the country. Stay tuned; we certainly will.

In this issue, you will find:

• Petro Killed the Left; Here's How

• The Sovereignty Gambit: Mexico’s Kill Switch Against US Pressure

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Colombia chose the right after four years of failure, but the gap is far larger than the 3% separating the two candidates who will advance to the runoff.

In perspective. Colombia’s presidential first round produced an interesting paradox. At first glance, the left did not completely collapse. Iván Cepeda won 9.7 million votes, advanced to the runoff, and finished provisionally less than three percentage points behind Abelardo de la Espriella. However, a closer look at the results reveals a far more troubling reality for the incumbent camp: Colombia’s left failed to grow beyond what was already its historical ceiling, while the right did.

• For months, political debate focused on polling. Some surveys showed Cepeda comfortably leading the first round, while others projected a tighter contest.

• The final result, however, revealed something more important than any individual percentage point: Cepeda’s electoral map is almost identical to Gustavo Petro’s in 2022.

• Municipal-level data, as seen in the graph elaborated by Michael Weintraub, show a correlation of roughly 0.98 between the two vote shares. The political geography of the Colombian left barely changed during four years in government. The same regions that voted for Petro voted for Cepeda.

Why it matters. The same strongholds remained loyal, and the same territories remained hostile. That is bad news for any political project seeking reelection. Governments that survive electorally usually expand their coalition. They persuade new constituencies, attract moderate voters, and broaden their political reach. Petrismo did exactly the opposite. It preserved its historical base but failed to conquer new ground. Bogotá illustrates this phenomenon perfectly.

• The capital registered approximately 329,000 additional voters compared to 2022. Yet Cepeda received roughly 65,000 fewer votes than Petro did four years ago.

• This means a significant share of new voters did not join the government’s bloc. That fact is particularly important because Bogotá often functions as a national political laboratory.

• What happens there frequently anticipates trends that later spread across the country. If the left is losing its ability to attract new voters in its principal urban center, the problem runs much deeper than a simple campaign failure.

Between the lines. The other major development in this election was the return of the center. In 2022, much of the moderate electorate was absorbed by Rodolfo Hernández’s candidacy. This time, the opposite occurred. Paloma Valencia, Sergio Fajardo, and Claudia López captured nearly 2.9 million votes. That political space reemerged and became the true kingmaker of the second round.

• This is where Cepeda’s main strategic challenge appears. Most of those voters are not naturally left-wing.

• Many supported alternatives to petrismo over the past several years. Others backed Petro in 2022 as part of the broader regional wave of rejection toward traditional political establishments that swept across Latin America after the pandemic.

• Four years later, however, the government’s record has substantially altered electoral incentives.

How it works. Rising insecurity, economic deterioration, and a growing perception of institutional exhaustion have turned Petro’s administration into an experiment many voters appear unwilling to repeat. That helps explain why betting markets are so decisive. At the time of writing, Polymarket gives Abelardo de la Espriella roughly an 83% probability of victory.

• This is not merely about the 673,000-vote advantage secured in the first round. It is about the natural direction of electoral transfers.

• Territorially, Paloma Valencia’s voters resemble De la Espriella’s electorate far more than Cepeda’s. Their strongest bases are concentrated in Antioquia, the Coffee Region, Tolima, and other territories where opposition to petrismo remains particularly intense.

• Even if some of those voters abstain or split their support, most realistic scenarios continue to favor the right-wing candidate.

Seen and unseen. Fajardo’s situation is more complicated, but it offers no guarantees for the government either. His voters are predominantly urban, moderate, and deeply skeptical of both petrismo and traditional uribismo.

• Convincing them to back Cepeda would require an extraordinarily efficient political operation at a time when the government faces mounting criticism.

• At the same time, uribismo’s endorsement of De la Espriella could prove decisive among that demographic.

In conclusion. The most important takeaway is that Colombia appears to have closed the political cycle it opened in 2022. That election took place amid a regional wave in which social discontent, post-pandemic inflation, and the exhaustion of traditional elites propelled numerous anti-establishment candidates into power. From Chile to Colombia, through Peru and elsewhere, voters sought disruptive alternatives. Yet governing has proven far less convincing than campaigning.

• What the first-round results reveal is the exhaustion of the political project that brought Petro to power.

• The Colombian left has exposed the limits of its growth. It preserved its strongholds, mobilized its base, and maintained its electoral geography intact. What it failed to do was expand, unlike the right.

• In a runoff election, where victory depends precisely on conquering new political territory, that may be the difference between competing and winning.

Mexico’s Congress recently approved a landmark constitutional amendment that introduces foreign interference as explicit grounds to annul electoral results. Driven by President Claudia Sheinbaum’s ruling Morena party, the legislation responds to growing friction with Washington and external scrutiny over domestic security and sovereignty concerns. By elevating this mechanism to a constitutional level, the reform fundamentally alters the legal parameters for validating democratic contests.

• However, the sweeping language of the bill has triggered a profound institutional debate regarding state overreach and the future of electoral integrity.

In perspective. The reform directly modifies Article 41 of the Mexican Constitution, embedding “foreign interference” into the legal framework that governs the nullification of public elections. Procedurally, the amendment defines interference through highly expansive categories, including illicit financing, propaganda, systematic disinformation, digital manipulation, and direct intervention by foreign governments or agencies. Because the legislation operates at the constitutional tier, its permanent integration into the legal system overrides standard electoral statutes, though it still requires ratification by a majority of state legislatures—a threshold Morena comfortably controls.

• The core institutional tension lies in the massive interpretive latitude granted to the Federal Electoral Tribunal, a body tasked with de-certifying elections under a framework where the boundary between legitimate international scrutiny and illicit meddling remains dangerously blurred.

• Modifying Article 41 secures a structural mechanism that transforms national sovereignty arguments into a powerful instrument of domestic electoral law.

• The mechanism places ultimate de-certification power in an electoral court system whose institutional autonomy has been deeply altered by recent changes to the judicial electoral system.

How it works. By anchoring election nullification within Article 41, Morena transforms a defensive legal shield into an offensive domestic and geopolitical instrument, backed by its structural alignment across the executive, legislative, and recently overhauled judicial branches. This systemic consolidation ensures that the state apparatus operates not as an impartial referee, but as an arbiter capable of deploying pre-electoral narratives of foreign victimization. Against the backdrop of an aggressive regional realignment—notably the rapid consolidation of Washington’s Shield of the Americas counter-cartel coalition across northern Central America—the reform functions as an insulation mechanism. It allows the ruling coalition to preemptively brand external transparency demands or domestic opposition breakthroughs as imperialist incursions, converting standard electoral friction into an asymmetric test of national sovereignty.

• Morena’s supermajorities in Congress, coupled with the sweeping restructuring of the judiciary, eliminate traditional checks, effectively transforming the Federal Electoral Tribunal into a politically aligned weapon for selective enforcement.

• The expansive definition of “interference” provides the regime with an unprecedented destabilization tool, allowing the state to selectively de-certify municipal, state, or legislative contests where opposition victories can be semantically tied to foreign funding, international NGOs, or Western media.

• The legislation constructs a robust pre-electoral narrative designed to blunt the tightening security encirclement from the US Shield of the Americas initiative, skillfully flipping bilateral counter-narcotics and intelligence pressure into a domestic rallying cry for regime survival.

Sovereignty gambits. The strategic implementation of the amendment represents a high-stakes geopolitical poker move in which Morena deliberately trades institutional stability for regime survival. By encoding a high-cost, easily triggered electoral kill switch, the ruling party creates a legal tripwire against aggressive cross-border maneuvers by Washington. If the United States materializes its unilateral threats of anti-cartel military operations or pushes aggressive intelligence interventions on Mexican soil, Morena can instantly freeze the domestic political landscape by invalidating upcoming midterm or regional contests under the banner of foreign aggression. However, weaponizing electoral nullification introduces severe governance hazards. It concentrates instability within a localized political ecosystem already deeply captured by organized crime, creating a volatile landscape where the degradation of democratic rules leaves traditional opposition parties structurally defenseless against hegemonic overreach.

• The reform serves as an institutional insurance policy against direct foreign intervention, enabling the regime to legally invalidate unfavorable municipal or state outcomes by designating external anti-narcotics pressure as democratic sabotage.

• Injecting structural electoral uncertainty into territories heavily contested by transnational criminal organizations risks triggering deep power vacuums, as cartels can actively exploit nullification windows to disrupt regional security coordination and expand territorial control.

• Because traditional political parties lack the institutional leverage to counter executive-controlled legal interpretations, the threshold for defining “interference” will be deployed selectively, permanently locking out opposition gains under the guise of national defense.

In conclusion. The constitutional weaponization of foreign interference marks a definitive transition toward a hyper-sovereigntist, insulated political regime in Mexico under Morena’s rule—captured by organized crime. Designed to neutralize aggressive security pressure from Washington, the strategy inadvertently exposes the domestic arena to severe structural fragmentation and institutional paralysis.

• Ultimately, by transforming the validation of democratic processes into an existential geopolitical bargaining chip, Sheinbaum and her coalition risk breaking the fragile equilibrium of internal governance.

• With that, Morena is paving the way for systemic instability from which neither local stability nor international partnerships can easily recover.