Smith's career in politics began when he was appointed a special United States commissioner to
Quito,
Ecuador, serving in this capacity from 1842 to 1845. There he served as Speaker of the House during the 1855 to 1856 session. The following session was his last as a representative of
Linn County. In 1857 Smith was a delegate to the
state's constitutional convention of that prepared the first constitution in preparation for statehood. Upon Oregon's admission to the Union as the 33rd state, Smith was elected to the Senate, serving from February 14 to March 4, 1859. He was an unsuccessful candidate for re-election. Less than two years after leaving the Senate, Delazon Smith died in
Portland on November 19, 1860, at the age of 44 years. His interment was at
Albany, Oregon in the Masonic Cemetery. ==Works authored==