Rui Costa (PT) holds an 83% implied probability for first place in the Bahia Senate race, reflecting recent polling that shows him leading the field for one of the two seats up for election on October 4. A Paraná Pesquisas survey released September 24 gave him 46.3% in a stimulated scenario allowing two choices, ahead of fellow PT candidate and incumbent Jaques Wagner at 34%. A concurrent Quaest poll placed Rui at 23% and Wagner at 17%, with opposition figures João Roma (PL) at 11% and Angelo Coronel (Republicanos) at 9%. Traders appear to view Rui’s strong name recognition as former governor and ex-Casa Civil minister, combined with PT organizational strength and consistent poll leads, as decisive factors positioning him well ahead of lower-polling candidates.