**Texas holds a 61.5% implied probability of producing the narrower Senate margin.** Both races rank among the tightest 2026 contests, with recent polling averages showing single-digit or sub-4-point spreads in each. In Alaska, Democrat Mary Peltola has held narrow leads or near-ties over incumbent Republican Dan Sullivan across October surveys (e.g., 48-47, 50-48, 51-49), though ranked-choice voting transfers could widen the final certified margin. In Texas, the open-seat matchup between Democrat James Talarico and Republican Ken Paxton has produced similarly tight results (Talarico +1 to +4 in multiple October polls), driven by heavy outside spending, shifting Latino and suburban voting patterns, and the state’s large electorate that can compress percentage margins. Traders appear to view Texas’s combination of polling volatility, demographic fluidity, and absence of RCV mechanics as more likely to deliver the smallest victory margin on Election Day.