LA PAZ, Bolivia (AP) — For Bolivia, the pandemic has been just part of the turmoil over the past 12 months.

A disputed election, Deadly riots. The toppling of Bolivia's first Indigenous president in what his backers considered a coup. The rise to power of a relatively obscure senator — and her failure to consolidate her presidency.

Now a presidential election on Sunday gives Bolivians at least a chance for a political reset as they struggle with the dramatic costs of the COVID-19 pandemic.

On a per capita basis, few countries have been hit harder than the impoverished, landlocked nation: Nearly 8,400 of its 11.6 million people have died of COVID-19.

The election will occur with physical distancing required between masked voters — at least officially,if not in practice.

The leading contenders are former Economy Minister Luis Arce, who led an extended boom under ousted President Evo Morales, and former President Carlos Mesa. a centrist historian and journalist who appeared to finish second to Morales in last year's annulled vote.

Trailing behind in all the polls have been Luis Fernando Camacho, a conservative businessman who helped lead last year's uprising, as well as a Korean-born evangelist.

Overshadowing the vote is the absence of Morales, who led Bolivia from 2006 until 2019 and was a key figure in the bloc of leftist leaders who held power across much of South America.

Morales, now exiled in Argentina, was barred from running for the presidency or even the Senate by electoral authorities following his ouster, and he chose Arce as his stand-in for the Movement Toward Socialism party.

A boyhood llama herder who became prominent leading a coca grower's union, Morales had been immensely popular while overseeing an export-led economic surge that reduced poverty during most of his term. But support was eroding due to his reluctance to leave power, increasing authoritarian impulses, a series of corruption scandals and conservatives' irritation over his promotion of Indigenous culture and “earth mother” religious observances.

He shrugged aside a public vote in favor of term limits and claimed he'd won at least a narrow first-round victory in the October 2019 presidential vote. But a lengthy pause in updated returns fed suspicions of fraud and nationwide protests broke out. At least 36 died in those protests or others later.

When police and military leaders suggested he leave, Morales resigned — along with most others in the chain of succession — and fled the country. Conservative Sen. Jeanne Áñez, perhaps fifth in line, proclaimed herself president and was accepted by the courts.

Her administration, despite lacking a majority in congress, set about trying to prosecute Morales and key aides while undoing his policies, helping prompt more unrest and polarization.

She dropped an attempt to win election this year while trailing badly in polls. The government twice delayed the vote, first set for May 3 and then Sept. 6.

Most polls have shown Arce with a lead, though likely not enough to avoid a November runoff, which will occur if none of the seven candidates gets at least 40% of the vote in addition to a 10 percentage point lead over the closest rival.

There's a strong chance the next president will struggle with a divided congress — and perhaps worse, an opposition that refuses to recognize defeat.

“No matter who wins, Bolivia will be extremely difficult to govern," said Michael Shifter, president of the Washington-based Interamerican Dialogue.

Mesa, 67, was vice president in 2003 when national protests led in part by Morales forced the resignation of President Gonzalo Sánchez de Lozada. Continuing unrest led Mesa himself to step down in 2005 and set up the elections that put Morales in power.

“These 14 years have been the worst inheritance in our history," he said Wednesday as he closed his campaign.

Mesa — coauthor of a leading history of Bolivia — tends to come off as a somewhat dull, uncharismatic intellectual, though his campaign season he has occasionally traded a suit coat for jeans and shirtsleeves and even danced to cumbia music.

“He is a centrist committed to democrati values, who understands the importance of reconciliation as a condition for advancement,” Shifter said.

Arce, 57, is a middle class economist with studies in England who took advantage of a boom in raw materials prices help Morales' socialist administration send Bolivia's economy booming — an advance he also credits to reduced inequality and state investment.

His backing depends heavily on working class and rural voters who remain loyal to Morales.

“We will recover democracy, reconstruct the economy and return stability to Bolivia,” he vowed repeatedly.