BOGOTA, Colombia (AP) -- Colombia's fragile peace deal looked increasingly under threat Sunday as right-wing parties critical of the accord performed well in congressional elections seen as a dry run for a hotly contested presidential ballot in May, while the current president's party slumped.
The vote was the first time former members of the Revolutionary Armed Forces of Colombia, or FARC, were competing after disarming as part of the 2016 peace deal for ending a half century of guerrilla war.
As expected, support for their radical agenda was soundly defeated, with FARC candidates getting less than 0.5 percent of the overall vote. That means their political party, also called FARC, will get only the 10 seats guaranteed them by the peace accord.
"The FARC are in a tough spot," said Leon Valencia, a former combatant who now runs the Peace and Reconciliation Foundation, a think tank. "A long war has generated lots of fear and rancor towards them."
By contrast, many of the accord's critics picked up seats, with the Democratic Center party led by former President Alvaro Uribe headed to being the biggest bloc in the Senate.
Uribe's hand-picked presidential candidate, Sen. Ivan Duque, easily swept an open primary among three conservative candidates in which more than 5.8 million people voted — a bigger haul than either of the top two finishers got in the first round of the 2014 presidential election.
President Juan Manuel Santos' coalition, which supported the peace deal, struggled. His Party of National Unity, which was the biggest political movement in the outgoing congress, finishes fifth overall.
The results are likely to lead to a last-minute scramble among candidates to form coalitions to better position themselves ahead of what is seen as a wide-open presidential race.
Two candidates under pressure to join forces are Humberto de la Calle, who was the government's chief peace negotiator, and former Gov. Sergio Fajardo. Both candidates have vowed to implement the peace deal. The Green Alliance, one of the parties supporting Fajardo, doubled its voting tally from the last congressional elections, though it only came in sixth overall this year.
Another candidate who has backed the peace deal is Gustavo Petro, a leftist former mayor of Bogota who has promised to raise taxes on the rich and unseat the country's political establishment. Petro won a leftist primary Sunday in which he got 2.8 million votes. It was 1.2 million votes less than Duque's total but still made him a top presidential contender.
"Our results were very positive," Petro told his followers. "The presidential campaign starts today."
Duque has said that while he would not "thrash" the peace accord with the FARC rebels, he would attempt to modify certain aspects, like a provision that allows the former rebels with drug-trafficking convictions to participate in politics. He has also called for tougher controls on the FARC's finances.
"A true peace is built through the triumph of the rule of law not through the relativization of justice," he told his followers after election results came in.
Sergio Guzman, a political analyst at Control Risks, said that while Duque's vote tally was impressive, it is still too early to tell if he will win the May 27 presidential election. Voters who are critical of the peace deal will be able to choose between Duque and German Vargas Lleras, the conservative leader of the Radical Change party. The pro peace deal vote is currently split among Gustavo Petro, Sergio Fajardo and Humberto de la Calle.