Question: In the Missouri gubernatorial election of 2008, Matt Blunt beat what American politician who is a member of the democratic party, and serves as the senior United State Senator from missouri?
Sentence (from "Missouri gubernatorial special election, 1857"): In the special election, held on August 7, 1857, the Democratic nominee, Robert Marcellus Stewart, defeated Know-Nothing candidate James S. Rollins (running under the American Party label) by a margin of only 334 votes.
Relevant evidence: No