Horton was elected as an Opposition Party candidate to the Thirty-fourth Congress and was reelected as a Republican to the Thirty-fifth Congress (March 4, 1855 – March 3, 1859).
Horton ran for office as a member of the Opposition Party in the Thirty-fourth Congress and later won re-election as a Republican in the Thirty-fifth Congress, serving from March 4, 1855, to March 3, 1859.