(Bloomberg) -- Kenyan opposition leader Raila Odinga, who’s running for president for a fifth time, drew ahead of rival candidate Deputy President William Ruto in an opinion poll before an election in August.

Odinga is favored by 39% of voters, compared with 35% for Ruto, Nairobi-based pollster Tifa Research said in an emailed statement on Wednesday. About 14% of respondents have yet to decide on their choice, and another 9% is unwilling to say who their preferred candidate is, the company said.

A survey by Tifa in April showed Ruto was the favorite to win the election with 39% support, compared with 32% for Odinga. The most recent poll was conducted after Odinga and Ruto in recent days named Martha Karua and Rigathi Gachagua as their running mates respectively.

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Odinga “is somewhat more popular than Ruto among older Kenyans,” Tifa said, “while more younger than older people are yet to make up their mind.”

A run-off contest is “very unlikely” unless other contenders, such as former Deputy President Kalonzo Musyoka, garner at least 5% support, it said.

To succeed President Uhuru Kenyatta, who is stepping down after two terms, the winner needs to win the majority vote and at least a quarter of the ballots cast in half of Kenya’s 47 counties.

Tifa Research interviewed 1,719 respondents on May 17. The survey has a margin error of plus or minus 2.34%, it said.

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