Question: The gubernatorial candidate who defeated W. J. Bryan Dorn was the first candidate from what party to be elected since the 1800s?
Sentence (from "Maryland gubernatorial election, 1966"): Baltimore County Executive Spiro Agnew, who would later go on to be selected by Richard M. Nixon as his running mate in 1968, was nominated by the Republican Party as their gubernatorial candidate.
Relevant evidence: No