Recent polls from Datafolha, Quaest, and RealTime Big Data through late September and early October show Marília Arraes (PDT) leading or tied for first in Pernambuco’s two-seat Senate race, with Humberto Costa (PT) close behind and Mendonça Filho (PL) and Eduardo da Fonte (PP) competing for the remaining spots. High undecided and blank/null shares, often exceeding 20-30%, combined with strategic split-ticket voting among left-leaning and right-leaning blocs, sustain tight positioning for second place. Late swings in Costa’s and Mendonça Filho’s numbers have kept multiple candidates viable within margins of error, while lower-polling names like Túlio Gadêlha remain marginal. With voting set for October 4, final campaign momentum and turnout patterns among core voter groups will determine separation among the top contenders.