Recent polling has lifted trader estimates of Democratic Senate control to the 64% range ahead of the November midterms. New York Times/Siena surveys released in early October showed Democratic candidates leading or tied in five Republican-held seats in states Trump carried by double digits in 2024, including Texas, Alaska, and Ohio, with narrower gaps in Iowa and Kansas. These results reflect a broader midterm environment in which Democrats have improved their position in battleground races, narrowing the net-seat deficit required for a majority. Prediction markets have incorporated the data, stabilizing near 64% for Democratic control, which directly supports the leading 64-66% bin in the October 9 market. No major countervailing events have emerged in the past week to reverse the shift.