Bolivia's current president, Evo Morales, will be the likely winner of Sunday's presidential election. Morales has been leading in recent polls, and as the country votes, he is expected to win in a landslide.

Morales, 55, is running for his third term as president of the South American nation, according to Reuters, and will likely win by a wide margin. Voters all over Bolivia lined up on Sunday to cast their ballots until 4 p.m. when polling stations closed.

Samuel Doria Medina, a cement magnate, trails Morales by 40 points though his campaign claims the poll has a margin of error of 33 points.

"This is why we're still optimistic," Doria Medina said after casting his vote. However, Morales' popularity and success guarantee his victory. If he wins, he would become Bolivia's longest-serving president, holding office until January 2020.

However, Morales must not only keep the presidency but also a two-thirds majority in the nation's congress, according to the Buenos Aires Herald. With this majority, Morales would have the opportunity to amend the constitution and allow himself to run indefinitely.

Morales changed Bolivia's constitution during his first term, allowing only two terms; however, a court decision concluded his first term did not apply.

Starting as a lowly coca farmer's union leader, Morales became the nation's first indigenous president in 2005 and has improved the Andean nation's economy and standard of living, elevating half a million people out of poverty.

According to TeleSur, since becoming president, Morales has done much to the benefit of his country, including raising the minimum wage; creating social programs that have lowered poverty from 38 percent in 2005 to 21 percent in 2012; increase infrastructure construction by building clinics, roads and schools; increase the nation's industrialization; passing a new constitution that emphasizes indigenous people's political rights and prioritizing Bolivian investment over foreign as well as other reforms.

Yet, the president still has critics. Aside from the conservative opposition, Morales has been criticized by environmentalists for his lack of support for environmental protection and emphasizing mining and building roads through the Amazon, according to Al-Jazeera.

"With the title of an indigenous government, they go into the international context claiming to be defenders of the Mother Earth, the environment and of indigenous rights," Fernando Vargas of the Green Party said, "but within the country, they are violating those principles."