Marina Silva-April 14, 2014
Former Brazilian Sen. Marina Silva reacts during a ceremony in Brasilia April 14 with former Pernambuco Gov. Eduardo Campos (who is not shown) to announce their candidacies for president and vice president of Brazil in the general elections to be held in October. Reuters/Ueslei Marcelino

SAO PAULO (Reuters) -- The Brazilian Socialist Party, or PSB, is likely to announce environmentalist Marina Silva as its presidential candidate next week, replacing party leader Eduardo Campos, who was killed in a plane clash, three leading local newspapers reported Saturday.

The PSB has agreed to rally around a Silva candidacy despite misgivings among some prominent members about her conservationist views and other issues such as economic policy, according to reports in Folha de S.Paulo, O Estado de S.Paulo and O Globo.

Silva’s candidacy is likely to be formally announced at a party meeting scheduled for Aug. 20, Folha said, adding that her running mate is expected to be Beto Albuquerque, a PSB congressman from the southern state of Rio Grande do Sul.

However, Globo and Estado said the party was still undecided about who would be Silva’s running mate.

“A Marina candidacy is contemplated in our political project. It’s a solution that ensures continuity,” the PSB’s new leader, Roberto Amaral, was quoted as saying.

A key PSB coalition ally told Reuters Friday that consensus was building around a Silva candidacy, but that many issues still had to be ironed out before a final decision could be made.

“There appears to be consensus in the party that Marina should take Eduardo’s place,” Roberto Freire, the leader of the Popular Socialist Party, told Reuters.

Silva, who was running as Campos’ vice presidential candidate on the PSB ticket, has told party leaders that she is willing to run in his place, the papers reported, citing unnamed sources who met with her in Sao Paulo late Friday.

Campos, a popular former governor of Pernambuco state, was killed in a plane crash on Wednesday on the way to a campaign event in the southeastern coastal city of Santos. The accident upended Brazil’s presidential race, with analysts and pollsters saying there is now a greater chance that the election will be decided in a second-round runoff Oct. 26. The first-round vote is scheduled for Oct. 5.

Campos, 49, was in third place in opinion polls, trailing incumbent President Dilma Rousseff, the candidate of the leftist Workers’ Party, and Aecio Neves, the centrist opposition candidate from the Brazilian Social Democracy Party.

Silva, who placed a strong third in the 2010 presidential race as the Green Party candidate, is hugely popular among younger voters who are disillusioned with Brazil’s political establishment. A devout Christian, she also has a loyal following among evangelical voters, an increasingly influential demographic in Brazil.

A Silva candidacy could deprive Rousseff of the votes she needs to avoid a runoff between the two best-placed candidates. A new survey to be published Monday will show whether Silva has more support than Neves, who has been running in second place in the polls.

(Reporting by Todd Benson; Editing by Erica Billingham.)