Several 2026 Senate contests remain exceptionally tight three weeks before Election Day, with polling averages and forecasts showing margins of 1 point or less in Iowa, Nebraska, Ohio (special), Kansas, and Texas. These races feature Democratic challengers or candidates performing near or above expectations in Republican-leaning states, reflecting a national environment that has narrowed traditional partisan gaps. Recent surveys through early October place several within or just beyond 1-point spreads, consistent with toss-up ratings from multiple forecasters. Final campaign events, turnout efforts in battleground areas, and any late shifts in voter sentiment could determine which margins fall inside 1 percent. Prediction market pricing on individual races aligns with this uncertainty, treating these as the primary candidates for the closest outcomes.