A Datafolha poll shows Brazilian President Luiz Inacio Lula da Silva and Senator Flavio Bolsonaro tied in a second-round runoff, each with 45% support.
In April, Lula had 45% and Flavio 46%, within the margin of error.
In the first round, Lula leads with 38% against Flavio's 35%.
The poll was conducted before reports of Flavio's alleged dealings with a former banker, which he denies.
