MEXICO CITY — Voters in Mexico will head to the polls Sunday for the largest election in the country’s history, electing a new president, Congress, nine governors and hundreds of mayors and local representatives.

This is taking place against a sobering backdrop of violence — over 130 candidates have been killed ahead of the elections.

Presidential candidate Andrés Manuel López Obrador, commonly known by his initials, AMLO, has held a steady lead throughout the elections.

For Miriam Carreno Campos, 33, López Obrador represents a break from the past, a break from corruption, a moral leader who has values and does what he says he does.

“He is the hope for the youth,” Carreno said of the leftist candidate.

Andres Manuel Lopez Obrador waves to supporters during the closing rally of his campaign in Mexico City, on June 27, 2018. Ronaldo Schemidt / AFP - Getty Images

López Obrador is running against Ricardo Anaya, of the right-left coalition National Action Party (PAN), and José Antonio Meade, from the ruling Institutional Revolutionary Party (PRI).

Most polls show that López Obrador will be elected president of Mexico on Sunday. A recent survey from the Mexican newspaper Reforma gave him 51 percent support, Anaya 27 percent and Meade 19 percent. The poll surveyed 1,200 registered voters and had a margin of error of four percentage points.

If López Obrador wins, he will become Mexico’s first left-leaning president in generations.

The Morena party is likewise expected to gain prominence in leadership in mayorships and governorships throughout Mexico and a majority in the national congress. With these wins Morena and López Obrador aim to curve rampant corruption and create a more inward domestic style of economic development and social policies.

“People in Mexico are looking for change. They have lived under the PRI for nearly 80 years and under the PAN for twelve years and are more than ready to try something different like AMLO,” said Mexican historian and Professor Andres Resendez from the University of California, Davis to NBC Latino.

But many throughout Mexico are worry that his policies could bring economic instability. Business leaders and foreign investors have concern with AMLO’s proposed protectionist policies that they say would slow down economic growth and future investments in the country. They protest that his policies would take a turn to what Venezuela’s current social economy policies have become. A wave of policies will also be aimed at the United States and that could come with repercussions from leaders at the White House, but it’s one of AMLO’s leading promises.

López Obrador ran on a platform of anti-corruption along with a plan to redirect spending to public works and social programs without new taxes, which appeals to Carreno, who works as a communications director at a private technological school, Tecnológico de Monterrey, in Mexico City.

“It’s the root of our most basic problem in Mexico,” she said, “a lack of investment in things like culture, arts, investigations, education, making it more attractive for our educated people to leave the country.”

The scourge of violence

Violence and corruption have been themes dominating the campaigns, both at the local and national levels. More than 37,000 people have disappeared in Mexico since 2007, according to a government database. Activists and independent watch groups claim the number is even higher.

Apart from the killings of at least 132 politicians, more than 300 have suffered some form of aggression since September, according to Etellekt, a Mexico City-based public policy consultancy.

For Juan Carlos, whose 71-year-old father disappeared 15 months ago from their hometown of Tepoztlán, a small colonial village just north of Mexico City, the violence and injustice are too widespread for any candidate to be able to stop.

Women march in Mexico City on May 26, 2018, holding banners that show the faces of some of the 43 students who went missing nearly four years ago. Anthony Vazquez / AP

“My feeling is that none of the candidates understand the problem we are facing and none of their proposals will change anything for the victims of violence and their families,” said Carlos.

Despite his misgivings, he is casting a vote.

"I’m voting for Anaya,” said Carlos. “It's not that I’m convinced to vote for Anaya, but I feel concerned about [López Obrador's] promises for amnesty for criminals.”

Political analyst Carlos Bravo Regidor said López Obrador is speaking about freeing lower-level offenders, “like the peasants who are cultivating poppy in the mountains of Guerrero, who are incredibly poor and incredibly isolated. Obrador says these people don’t belong in jail.”

But for Carlos, who will vote this Sunday for the first time without his father, “it’s everything that leads to impunity. You don’t have to be a member of a gang or cartel to be a criminal," he said, "and the chances of you being caught are so low in Mexico that so many people feel the power of taking someone’s life and get away with it.”

Mexican presidential candidate Ricardo Anaya kicks a soccer ball to supporters during a campaign rally in Mexico City on June 24, 2018. Ramon Espinosa / AP

While López Obrador leads the polls, the battle for second place is between Anaya and Meade.

Bravo Regidor thinks Meade will not win because he belongs to the same party as the country's current president, Enrique Peña Nieto.

Among the issues that have dogged Peña Nieto is Mexico's response to the U.S. since Donald Trump's candidacy and presidency, including his calls for a wall and the issues regarding trade and tariffs.

Jose Antonio Meade greets supporters during a campaign rally in Saltillo, Mexico, on une 27, 2018. Alberto Puente / Reuters

“One of the reasons people want to remove the PRI from power is how the Trump administration has been handled by President Nieto,” said Juan Gómez-Cruces, 35, who lives in Atlanta. Mexicans in the U.S. could register to participate in their home country's election.

Gómez-Cruces says he remembers Nieto inviting Trump to Mexico when he was still a candidate. “It was embarrassing,” said Gomez, “and now after what’s happened with immigration, the separation of children, people don’t think Nieto is strong with Trump.”

López Obrador's early stance against Trump, including saying he would denounce the building of a wall as a human rights violation, garnered him early attention and support.

Supporters of López Obrador are worried that he will lose the election to corruption. But the buildup of the Morena party and its coalitions have amassed great political power that makes a win almost a certainty. The party was created in 2011 to elevate López Obrador's presidential bid for the 2012 election.

Morena consists of a coalition of political parties made up of the leftist Labor Party (PL) and the right wing Social Encounter Party (PES).

“AMLO has such a commanding lead in the polls this time around that, even if there is some corruption and fraud, as it will probably occur in localized instances, it is inconceivable that it will be of such a magnitude that it would alter the election in any fundamental way," said Reséndez. " At this point it seems like a clear-cut outcome."

There are 87 million Mexicans in the country and abroad who are registered to vote. President Enrique Peña Nieto’s successor will take office Dec. 1.

NBC News producer Annie Rose Ramos reported from Mexico City and NBC Latino contributor Irvis Orozco reported from Sacramento, California.

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