Sanderson secured first place in the Rio Grande do Sul Senate race with 30.11% of valid votes, narrowly ahead of Marcel Van Hattem at 30.08%, according to official TSE results with full ballots counted on October 4. The PL candidate benefited from a coordinated "dobradinha" campaign with Van Hattem under the right-leaning "O Rio Grande Pode Mais" coalition, which also backed the successful gubernatorial bid of Luciano Zucco. Pre-election surveys showed the pair leading or tied with left-aligned rivals Manuela D'Ávila and Paulo Pimenta, who finished well behind at 17% and 16%. Sanderson's profile as a federal deputy and former federal police officer aligned with voter priorities on public security and institutional checks, while the coalition's unified messaging consolidated support in a contest for two seats. Official certification remains the final step for market resolution.