Rui Costa (PT) holds the strongest position in the Bahia Senate race for one of two seats, driven by consistent leads in late September polling from institutes including Paraná Pesquisas and Quaest, where he tops or shares the top spot with high name recognition as former governor and ex-Casa Civil minister. Fellow PT candidate and incumbent Jaques Wagner follows as the main intra-party contender, while opposition figures João Roma (PL) and Angelo Coronel (Republicanos) trail amid divided anti-PT support. With voting set for October 4 and each elector selecting two senators, recent surveys show Rui Costa ahead on combined preferences, reflecting Bahia's established PT base and limited movement in the final weeks before the first-round contest.