The intervention comes as new New York Times/Siena University polls show Democrats are tied or leading in 5 reliably Republican states, including Kansas and Mississippi. Although no Democratic candidate has come within 8 points of winning the South Carolina seat this century, recent trends have led some proponents to believe the race is now winnable for Dr. Andrews. The results of the contest next month will indicate whether the party can maintain its hold on the seat or faces a broader midterm comeback by Democrats.
