(CNN) -- He's a former army officer who was linked to a 2000 military uprising and accused of being an extreme leftist. She's the daughter of a former president who's serving a 25-year sentence for human rights violations. About the only thing they have in common is that they both want to be the next president of Peru.
Forty-eight-year-old Ollanta Humala lost the 2006 presidential election in Peru mainly because he was depicted as a close ally of Venezuelan President Hugo Chavez's. That's a point that his rival, 36-year-old Keiko Fujimori, a right-wing lawmaker, has frequently used against him.
At his campaign closing rally this week in Paseo Colon, a historic avenue in the capital of Lima, Fujimori once again went on the offensive as she addressed a crowd of thousand of supporters.
"There are recordings and witnesses that prove that this gentleman is a good soldier of Chavez," Fujimori said to cheering crowds. "I am not going to allow other countries to interfere in the sovereignty of our country. I'm going to defend it!"
But in a recent interview with CNN en español, Humala denied that his goal is a Chavez-style social revolution in Peru.
"When we speak about revolution, we're speaking about a revolution in education which is something fundamental," Humala said. "We have to build our own future. We believe that the Venezuelan model doesn't apply in Peru."
Some analysts say Peruvians will choose the lesser of two evils, a choice of "extremes" in Sunday's runoff election.
Andrea Stiglich, a member of the Economist Intelligence Unit team of Latin American analysts, says that this is the election of the "lesser evil" and that's what Peruvians are trying to do Sunday.
"This election was meant to be the election of a centrist policy continuity candidate, and what we have is a first round that has yielded a result between two extremes in the left and the right," Stiglich said.
In the first round of elections held April 10, all of the centrist candidates were eliminated, including former President Alejandro Toledo, former Lima Mayor Luis Castañeda and former Finance Minister Pedro Pablo Kuczynski.
In the first round, Humala garnered more than 30% of the vote, while Fujimori ended slightly above 23%. Under Peruvian law, only the top two contenders advance to a second round for presidential elections.
Fujimori has had to defend her father's actions throughout the campaign. Former President Alberto Fujimori was found guilty of human rights abuses in 2009. But many in Peru also credit him with bringing back peace to the South American nation after years of violence generated by the Maoist guerrillas known as Sendero Luminoso or Shinning Path.
Some also credit Alberto Fujimori with spearheading economic reforms that brought stability to the Peruvian economy.
During the campaign, protesters accused the presidential candidate of planning to grant her father amnesty if she wins, as she said she might do in a 2008 interview.
Fujimori has since backed away from those remarks.
The most recent polls show that the candidates are neck and neck. After the elimination of the more centrist candidates in April, Peru's 2010 Nobel literary laureate Mario Vargas Llosa, a former presidential candidate himself, described the race as a choice between "terminal cancer and AIDS."