Question: Thad Cochran defeated a man in 2014 who represents what district in Mississippi?
Sentence (from "Thad Cochran"): He is the current senior United States Senator from Mississippi (the third most-senior Senator and the second most-senior Republican member), first elected to the Senate in 1978, and the Chairman of the Senate Appropriations Committee, which he had also chaired from 2005 to 2007.
Relevant evidence: No