(Bloomberg) -- Colombian leftist leader Gustavo Petro no longer enjoys a clear path to victory in the upcoming presidential election, according to a new poll.   

The survey, conducted by the National Consulting Center and published by Semana magazine on Saturday, suggests a tightening race between Petro and his main rival, conservative candidate Federico “Fico” Gutierrez. 

In the likely scenario that the two face each other in a runoff, Petro would receive 43.1% of votes, while Gutierrez would get 40.1%, -- just within the poll’s margin of error of plus or minus 1.5 percentage point. Previous polls showed Petro easily beating all his main rivals in a second round. 

Petro, 61, has called for a new economic model that doesn’t rely on oil and coal. He is popular with young and low-income voters, while many business leaders fear him. Gutierrez, 47-year-old former mayor of Medellin, has vowed to take a tougher stance on security issues.

Colombians vote for president on May 29 with a likely runoff in June. 

Other poll findings: 

  • Petro remains the most popular individual candidate, though many centrist voters would back his rival in the runoff.
  • Some 36.5% of polled voters said they would support Petro in the first round, up from 32.1% in the Semana poll conducted two weeks earlier. Gutierrez has 24.5% support.
  • Former mayor of Bucaramanga Rodolfo Hernandez is running third with backing of 10% of voters
    • Sergio Fajardo, who won the center-left primary this month, is fourth with 8.4%
  • Petro would beat Fajardo in a runoff with 41.5% vs. 38.3%
  • The poll of 4,206 likely voters was conducted from March 28 to 31

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