The crowded field of 13 registered candidates for Roraima's two Senate seats, following the close of registrations in mid-August 2026, has produced tightly clustered probabilities around 40-50% for multiple contenders. Recent party conventions and launches, including those by MDB, PSDB, and smaller parties, have expanded options without clear frontrunners emerging in available data. Fragmentation across ideological lines and limited recent polling keep the first-place outcome contested, with trader consensus reflecting uncertainty over voter consolidation. Scheduled debates, endorsements, and any new surveys in the coming weeks before the October 4 election could shift momentum toward separation among the leaders.