Question: Walker County was named after which member of the US Senate from Mississippi?
Sentence (from "Robert J. Walker"): An active member of the Democratic Party, he served as a member of the U.S. Senate from Mississippi from 1835 until 1845, as Secretary of the Treasury from 1845 to 1849 during the administration of President James K. Polk, and briefly as Territorial Governor of Kansas in 1857.
Relevant evidence: Yes