Watts served as a member of the Indiana House of Representatives in 1846 and 1847. He then became an associate justice of the United States court in the territory of New Mexico in 1851. In 1854, Watts resigned his post and returned to the practice of law. Watts was elected as a
Republican delegate to the
Thirty-seventh Congress (March 4, 1861 – March 3, 1863). He was also a delegate to the 1864 Republican National Convention. Watts helped to equip troops for the
Union Army during the
Civil War. On July 11, 1868, Watts was appointed chief justice of the
New Mexico Territorial Supreme Court by President
Andrew Johnson. Watts served on the Territorial Supreme Court for one year and then practiced law in Santa Fe. He also engaged in land speculation, and one of his land purchases led to a decades-long legal battle culminating in a 1914 U.S. Supreme Court decision. ==Personal life and death==