BOGOTA, Colombia — Juan Manuel Santos convincingly won re-election Sunday after Colombia's tightest presidential contest in years, an endorsement of his 18-month-old peace talks to end the Western Hemisphere's longest-running conflict.
Santos defeated right-wing challenger Oscar Ivan Zuluaga with 53 percent to 47 percent of valid votes with 99.9 percent of precincts reporting.
Zuluaga was backed by former two-term President Alvaro Uribe, who many considered the true challenger.
Zuluaga and Uribe accused Santos of selling Colombia out in slow-moving Cuba-based negotiations, and insisted Zuluaga would halt the talks unless the rebel Revolutionary Armed Forces of Colombia, known as the FARC, ceased all hostilities and some of its leaders accepted jail time.
The outcome affirmed Santos' claim to be steering Colombia to a historic crossroads after a crippling conflict that has claimed more than 200,000 lives, mostly civilians.
"This is the end of more than 50 years of violence in our country and it is the beginning of a Colombia with more justice and social inclusion," Santos told cheering supporters in his victory speech. He vowed to "dedicate all my energies and all the energies of my government" to sealing an accord.
Santos, 62, flashed his palm emblazoned with the word "Paz," or peace — his campaign slogan. Many in the crowd also had the word written on their palms.
A FARC spokeswoman in Havana said the rebels had no comment on the election's results.
The campaign was the Andean nation's dirtiest in years, and Uribe alleged widespread vote-buying by the Santos camp right up to the closing of polls. Zuluaga nevertheless graciously conceded shortly after the result became known.
Santos' win was a comeback of sorts — Zuluaga beat him in the first round of five candidates May 25.
Analyst Adam Isacson of the Washington Office on Latin America called the election less a vote on the peace process than "a referendum on Alvaro Uribe and his role in Colombian society."
"The eight years he was president were a time of some of the worst corruption and biggest scandals," said Bogota business consultant Maria Eugenia Silva, citing his "nefarious" record as a big reason she opted for Santos.