Professora Dorinha (União Brasil) leads the Tocantins governor race at 59.5% implied probability after securing 45.52% of valid votes in the October 4 first round, ahead of Vicentinho Júnior (PSDB) at 43.94%. The narrow margin triggered a October 25 runoff, the state's third such contest. Pre-election polling from Quaest and Real Time Big Data showed Dorinha ahead by 4–13 points in the first round, consistent with her stronger legislative coalition that elected most federal and state deputies. Vicentinho's narrower path depends on consolidating support from eliminated candidates such as Laurez Moreira (PSD). The tight positioning reflects the first-round closeness, undecided voters shifting between the two, and the absence of a majority winner. Upcoming alliance negotiations and second-round turnout will determine whether the gap widens or remains competitive.