Bolivian President Evo Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power.

The 59-year-old leftist, who is seeking a fourth term, still appears to lead in polls. But some surveys say he's likely to fall short of a first-round victory and could be vulnerable to a united opposition in a December runoff.

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People walk past a wall painted with political propaganda in support of President Evo Morales in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20, with Morales running for another term as president. (AP PhotoJorge Saenz)

Bolivian President Evo Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power.

A woman sells chicken heads on a street in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

An Oct. 4-6 poll by the San Andres Higher University and other institutions showed Morales apparently leading his nearest rival, former President Carlos Mesa, 32% to 27% heading into the first round of voting, with the rest split among other candidates.

A political propaganda billboard of presidential candidate Oscar Ortiz stands over a crowded intersection in El Alto, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20. (AP PhotoJorge Saenz)

Morales grew up as a llama shepherd in the Bolivian highlands and became famous as the fiery leader of a coca growers' union fighting U.S.-backed attempts to stifle the crop, a mild stimulant deeply rooted in Bolivian culture but which is also the raw material for cocaine.

Women smile on a street of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20. (AP PhotoJorge Saenz)

But conservatives have always distrusted the leader of the Movement Toward Socialism party, and have been outraged by corruption scandals, such as an alleged embezzlement of $6.8 million from a fund for indigenous people, as well as allegations of partisan manipulation of the justice system.

Cars drive past a wall emblazoned with the first name of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

Many young Bolivians also have no recollection of a president other than Morales, and some say they are ready for change despite years of economic and political stability.

A woman rides a cable car that connects the city La Paz and El Alto, Bolivia, on a rainy Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJuan Karita)

While Morales has avoided the personal corruption scandals that have tarred or toppled leaders in neighboring Argentina, Brazil and Peru, Human Rights Watch has accused his government of undermining judicial independence by arbitrarily dismissing nearly 100 judges since 2017. The group said the judges were not given any reason for the dismissals by a Magistrates Council dominated by allies of Morales.

A woman walks past a mural promoting the re-election of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

A woman walks past a mural promoting the re-election of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

A couple shops for a Cholita-styled dress in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career.  (AP PhotoJorge Saenz)

A couple shops for a Cholita-styled dress in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A billboard promoting presidential candidate Carlos Mesa towers over commuters in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Mesa, a 66-year-old journalist and historian, is the closest rival to front-runner President Evo Morales, who is South America’s longest-serving leftist leader and is seeking an unprecedented fourth term on Sunday in the country’s general elections. (AP PhotoJorge Saenz)

A billboard promoting presidential candidate Carlos Mesa towers over commuters in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Mesa, a 66-year-old journalist and historian, is the closest rival to front-runner President Evo Morales, who is South America’s longest-serving leftist leader and is seeking an unprecedented fourth term on Sunday in the country’s general elections. (AP PhotoJorge Saenz)

A death doll dangles from a pole as a warning to thieves in a neighborhood in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career.  (AP PhotoJorge Saenz)

A death doll dangles from a pole as a warning to thieves in a neighborhood in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A vendor brings down a Cholita-styled skirt in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A vendor brings down a Cholita-styled skirt in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

Bolivia's first indigenous president is credited with pragmatic economic stewardship that spread the Andean country's natural gas and mineral wealth among the masses. But he has lost support among voters frustrated by corruption scandals affecting his administration and his refusal to accept a referendum on limiting presidential terms. Critics also accuse him of a delayed response to vast forest fires this year that they blame on his push to develop areas with slash-and-burn agriculture.

People walk past a wall painted with political propaganda in support of President Evo Morales in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20, with Morales running for another term as president. (AP PhotoJorge Saenz)

People walk past a wall painted with political propaganda in support of President Evo Morales in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20, with Morales running for another term as president. (AP PhotoJorge Saenz)

An Oct. 4-6 poll by the San Andres Higher University and other institutions showed Morales apparently leading his nearest rival, former President Carlos Mesa, 32% to 27% heading into the first round of voting, with the rest split among other candidates.

That would set up a runoff, and the poll showed Morales and Mesa essentially tied at just under 36% each in a two-way race — with the rest of those surveyed saying they were undecided, would cast a null ballot or declining to state a preference. The poll surveyed 14,420 people and the margin of error was 2.8 percentage points.

"It's definitely the closest election and we're facing the possibility that Morales can be defeated after 14 years of government," political analyst Jorge Dulón, said.

A woman sells chicken heads on a street in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A woman sells chicken heads on a street in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

Morales grew up as a llama shepherd in the Bolivian highlands and became famous as the fiery leader of a coca growers' union fighting U.S.-backed attempts to stifle the crop, a mild stimulant deeply rooted in Bolivian culture but which is also the raw material for cocaine.

As president, he presided over more than a decade of business-boosting economic growth in South America's poorest country while allying himself with a leftist bloc of Latin American leaders including Venezuela's Hugo Chavez, Brazil's Luis Inacio Lula da Silva and Ecuador's Rafael Correa. He retains wide support and continues to capitalize on his everyman image as a champion of the poor.

"As long as we're united, we'll keep defeating those who don't love the Bolivian people," Morales said in the campaign trail this week referring to the opposition.

A political propaganda billboard of presidential candidate Oscar Ortiz stands over a crowded intersection in El Alto, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20. (AP PhotoJorge Saenz)

A political propaganda billboard of presidential candidate Oscar Ortiz stands over a crowded intersection in El Alto, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20. (AP PhotoJorge Saenz)

But conservatives have always distrusted the leader of the Movement Toward Socialism party, and have been outraged by corruption scandals, such as an alleged embezzlement of $6.8 million from a fund for indigenous people, as well as allegations of partisan manipulation of the justice system.

Many Bolivians also were angered by his decision to seek another re-election despite a popular referendum that upheld term limits. South America's longest-serving current leader was able to run only because of a Supreme Court ruling that decided that the limits violated his political rights.

"What really has deteriorated his power is failing to respect the 2016 referendum that said no to his re-election," Dulón said.

Women smile on a street of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20. (AP PhotoJorge Saenz)

Women smile on a street of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivia will hold general elections on Oct. 20. (AP PhotoJorge Saenz)

Many young Bolivians also have no recollection of a president other than Morales, and some say they are ready for change despite years of economic and political stability.

Mesa, who had been vice president, took power when his predecessor resigned in 2003 amid massive protests, and stepped aside himself in 2005 amid renewed demonstrations led by Morales. The 66-year-old journalist and historian has described the election as a choice "between dictatorship and democracy."

Morales and Mesa closed their campaigns on Wednesday in La Paz and in the eastern city of Santa Cruz, a bastion of the opposition. Neither is expected to gain a majority in Congress, which could lead to an impasse for the upcoming administration.

Cars drive past a wall emblazoned with the first name of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

Cars drive past a wall emblazoned with the first name of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

While Morales has avoided the personal corruption scandals that have tarred or toppled leaders in neighboring Argentina, Brazil and Peru, Human Rights Watch has accused his government of undermining judicial independence by arbitrarily dismissing nearly 100 judges since 2017. The group said the judges were not given any reason for the dismissals by a Magistrates Council dominated by allies of Morales.

"I'm worried about the day after the elections," Stefan Duppel, the German ambassador to La Paz, said recently. "There's an atmosphere of distrust and it's key to guarantee that the elections are as clean as possible."

A woman rides a cable car that connects the city La Paz and El Alto, Bolivia, on a rainy Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJuan Karita)

A woman rides a cable car that connects the city La Paz and El Alto, Bolivia, on a rainy Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJuan Karita)

A woman walks past a mural promoting the re-election of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

A woman walks past a mural promoting the re-election of Bolivia's President Evo Morales, in La Paz, Bolivia, Friday, Oct. 18, 2019. Morales faces the tightest election of his political career Sunday as he tries to extend his nearly 14 years in power. (AP PhotoJuan Karita)

A couple shops for a Cholita-styled dress in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career.  (AP PhotoJorge Saenz)

A couple shops for a Cholita-styled dress in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A billboard promoting presidential candidate Carlos Mesa towers over commuters in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Mesa, a 66-year-old journalist and historian, is the closest rival to front-runner President Evo Morales, who is South America’s longest-serving leftist leader and is seeking an unprecedented fourth term on Sunday in the country’s general elections. (AP PhotoJorge Saenz)

A billboard promoting presidential candidate Carlos Mesa towers over commuters in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Mesa, a 66-year-old journalist and historian, is the closest rival to front-runner President Evo Morales, who is South America’s longest-serving leftist leader and is seeking an unprecedented fourth term on Sunday in the country’s general elections. (AP PhotoJorge Saenz)

A death doll dangles from a pole as a warning to thieves in a neighborhood in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career.  (AP PhotoJorge Saenz)

A death doll dangles from a pole as a warning to thieves in a neighborhood in La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A vendor brings down a Cholita-styled skirt in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)

A vendor brings down a Cholita-styled skirt in El Alto, on the outskirts of La Paz, Bolivia, Friday, Oct. 18, 2019. Bolivian voters will decide Sunday whether they will seek change after nearly 14 years under President Evo Morales or allow him to continue to consolidate power in the most contested election of his political career. (AP PhotoJorge Saenz)