Flávio Bolsonaro starts the runoff campaign in front.

The first Datafolha poll since Sunday's vote shows the senator at 49% and President Luiz Inácio Lula da Silva at 45%, Reuters reported. The margin of error is 2 points, so the pollster calls it a technical tie. Among valid votes, which leave out blank ballots and undecided voters, Bolsonaro leads 52% to 48%, G1 reported. Datafolha surveyed 2,520 people on Oct. 6 and 7.

A second poll shows a wider gap. A PoderData/Aya survey released Thursday has Bolsonaro at 53% and Lula at 47%, Anadolu Agency reported. That poll had the two tied at 50% before the first round.

Bolsonaro also picked up support from the man who finished third. Author and psychiatrist Augusto Cury endorsed him on Thursday, Reuters reported. Cury won 2.89% of valid votes and had campaigned as neither left nor right. Ronaldo Caiado, another top-five finisher, backed Bolsonaro earlier this week. Renan Santos said he will not endorse either candidate.

Those endorsements are a shift. Right after Sunday's vote, the Associated Press reported that Cury, Caiado and Santos had said they would not back either finalist.

In the first round, Bolsonaro won 47.03% of valid votes to Lula's 45.16%. Neither cleared the 50% needed to win outright.

How this fits: Lula, 80, is seeking a fourth term. Bolsonaro, 45, is the eldest son of former President Jair Bolsonaro and an ally of President Trump. The next term begins Jan. 5.

Both camps now have just over two weeks to win over voters whose candidates were knocked out. More pollsters are expected to release runoff surveys soon.

What we know: Bolsonaro leads both new polls, and the third-place finisher has endorsed him.
What we don't: Whether Lula can close the gap before Oct. 25, and how many voters will stay home.