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Support for Marina Silva appears to be dropping as Rousseff has stepped up attacks on the environmentalist.
If Rousseff has to face a run-off with nearest rival Silva, she would win by 49-41 per cent, the poll showed.
The Brazilian President pointed towards serious risks of paralysis and inaction of the UN Security Council.
The largest country in South America goes for presidential polls on October 5.
A FIFA study noted greater risk-taking by players and the growing role of goalkeepers to determine the outcome of matches.
Consumer confidence is dwindling, some economists say, as industry appears to slow down.
The GDP data could dampen the re-election campaign of President Dilma Rousseff.
Campos was running third in opinion polls ahead of the October presidential polls.