The tight contest between Republican Darline Graham and Democrat Annie Andrews, reflected in recent polling averages showing leads of just 1-4 points, stands as the main factor anchoring trader consensus around 1.6M-2M total ballots in South Carolina’s November 3 Senate election. Recent surveys from InsiderAdvantage and Trafalgar highlight high undecided shares near 9% and shifting support among independents and younger voters, while the October 11 debate and early voting window from October 19-31 could lift participation above typical midterm levels near 43% of eligible voters. Registration deadlines ending October 5 and mobilization efforts tied to the competitive Senate race, alongside down-ballot contests, add uncertainty that keeps the two central turnout bins closely matched without clear separation.