Campbell was elected as a Republican to the Fifty-ninth Congress (March 4, 1905 โ March 3, 1907).
He was an unsuccessful candidate for reelection in 1906 to the Sixtieth Congress and for election in 1908 to the Sixty-first Congress.
He resumed the practice of law in Napoleon, Ohio.
He served as member of the State constitutional convention of 1911 and 1912.
He died in Napoleon, Ohio, August 13, 1927.
He was interred in Forest Hill Cemetery.