He was first elected to the Assembly for the 1862 session,[1] representing the 3rd Columbia County district (Courtland, Fort Winnebago, Marcellon, Randolph, Scott, Springvale and Wyocena, succeeding James H. Bonney (also a farmer and a Republican).
Sanderson (now living in Poynette) returned to the Assembly for the 1866 session, this time from the 2nd Columbia County district, succeeding Jesse Hand, another farmer and member of the Union Party (the label which the Republicans were using during this era).
[6] He returned in 1868, although by that time the Union Party label had been abandoned; he was assigned to the committees on privileges and elections; on agriculture; and on railroads (chairing the latter).
In 1876 Sanderson sold all his interests in Wisconsin and moved to Texas,[1] whose climate and custom of free range husbandry suited his preferences.
[10] When the San Angelo National Bank was organized, Sanderson was elected its president, and held that office until his death on June 18, 1887.