The 2019 Bolivian election was rigged

The 2019 Bolivian election was rigged
	DISPUTED
	"President Evo Morales's victory in Bolivia's October 20, 2019, presidential election was secured through deliberate fraud, as shown by an unexplained shift in the vote count that pushed him past the threshold needed to avoid a runoff."
Domain	Politics & Elections
Tactic	Statistical & Evidentiary Distortion;
Era	Current
First seen	2019
Origin	Opposition claims on election night, a preliminary statement and later audit by the Organization of American States (OAS), and subsequent academic analyses on both sides
Last reviewed	2026-10-27
	Further reading: books on Politics & Elections

The claim that the 2019 Bolivian election was rigged is a genuinely disputed question that had dramatic consequences. Evo Morales, Bolivia's first Indigenous president, was seeking a fourth term. After a pause in the preliminary vote count, his margin over his main rival widened just enough to avoid a runoff. The Organization of American States (OAS) said the shift was difficult to explain and later reported "deliberate manipulation" and serious irregularities. Weeks of protests followed, the military suggested that Morales resign, and he left office and the country. Several academic analyses later challenged the OAS's statistical reasoning, while others supported findings of irregularities. Bolivia's political camps still disagree about what happened.

Background

Morales had been president since 2006. In 2016 Bolivians narrowly rejected, in a referendum, a constitutional change that would have allowed him another term, but the country's constitutional court later ruled that term limits violated his political rights, allowing him to run in 2019. Under Bolivian rules, a candidate avoids a runoff by winning more than 40 percent of the vote with a lead of at least 10 percentage points.

The claim

On election night, Bolivia's preliminary quick count, a system for reporting unofficial results, stopped at about 84 percent of tally sheets counted, with Morales leading Carlos Mesa by about 8 points, suggesting a runoff. When reporting resumed nearly 24 hours later, Morales's lead had grown to just over 10 points. The opposition alleged fraud. The OAS observer mission said in a preliminary statement on October 21 that it was concerned by a drastic and hard-to-explain change in the trend. An OAS audit released in December 2019 reported that it had found deliberate manipulation and serious irregularities, including undisclosed servers used in the counting process and altered tally sheets, and concluded that it could not validate the results.

The dispute

Challenges to the OAS analysis. Researchers associated with the Center for Economic and Policy Research, and separately two researchers at the Massachusetts Institute of Technology's Election Data and Science Lab writing in The Washington Post in February 2020, argued that the late shift could be explained by the fact that results from rural areas, where Morales was strongest, were reported later. They said the OAS's statistical case for fraud was flawed. A 2020 analysis published by researchers including Nicolás Idrobo, Dorothy Kronick and Francisco Rodríguez reached a similar conclusion about the timing pattern.
Support for irregularities. Other analysts, and the OAS, maintained that the audit's findings about technical irregularities and altered tally sheets were independent of the statistical argument. Some academic studies found patterns they considered consistent with manipulation in particular areas.
No final resolution. The question of whether fraud occurred, and whether it changed the outcome, has not been definitively settled.

Consequences

Protests and counter-protests turned violent. On November 10, 2019, after the head of the armed forces publicly suggested he resign, Morales stepped down and went into exile, calling his removal a coup. An interim government led by Senator Jeanine Áñez took power; security forces killed protesters in incidents at Sacaba and Senkata. In a rerun election in October 2020, Morales's party candidate, Luis Arce, won with about 55 percent of the vote. Áñez was later convicted in Bolivia of offenses related to taking power, a prosecution her supporters called political.

Why it matters

The Bolivian case shows how statistical claims about elections can carry enormous weight, how international observers' early statements can shape events before full analysis is complete, and how a disputed election can be interpreted through rival political narratives, as either a fraud or a coup.

Lessons for readers

A sudden change in a vote count can have innocent explanations, such as the order in which areas report.
Distinguish between statistical arguments and documentary evidence of irregularities.
Preliminary statements by observers are not final conclusions.
When experts disagree, avoid treating either side's claim as settled.
Consider how political narratives on all sides interpret the same events.

Sources

Organization of American States, Electoral Integrity Analysis: General Elections in the Plurinational State of Bolivia, October 20, 2019 (December 2019).
John Curiel and Jack R. Williams, "Bolivia dismissed its October elections as fraudulent. Our research found no reason to suspect fraud," The Washington Post, February 27, 2020.
Nicolás Idrobo, Dorothy Kronick and Francisco Rodríguez, "Do Shifts in Late-Counted Votes Signal Fraud? Evidence from Bolivia," Journal of Politics 84, no. 4 (2022).
Center for Economic and Policy Research, What Happened in Bolivia's 2019 Vote Count? (November 2019).