He moved to Appleton in 1850, which was then part of Brown County, and was elected District Attorney of Brown County in 1850. In 1852, after Outagamie County was created from the southwest corner of Brown County, he was elected District Attorney for the new county, serving another two years. Also during this time, he was chosen by the Wisconsin Legislature as a commissioner to help identify a suitable location for the State Hospital for the Insane.[4]
He relocated to Dane County in the fall of 1854 and resided in Mazomanie, in western Dane County. In Mazomanie, he was elected to three consecutive terms in the Wisconsin State Assembly, serving in the 1862, 1863, and 1864 sessions. In 1864, he moved into the city of Madison, and, after three years practicing law in Madison, he was elected mayor in the April 1867 election, defeating businessman Andrew Proudfit. He was elected to two years as City Attorney, in 1869 and 1870, and, in the November election, was chosen to represent Madison in the Wisconsin State Assembly for the 1870 session. He ran for mayor again in 1872, but was defeated by Republican James L. Hill. Sanborn returned to city government as alderman for Madison's 2nd ward in the 1875 and 1876 city council sessions.[4]
In 1877, Sanborn was elected County Judge in the April election. He was subsequently re-elected in 1881 and 1885, but died before the start of his third term.[3]
Personal life and family
Alden Sprague Sanborn married Huldah M. Eastman, of Haverhill, New Hampshire, in Milwaukee, on February 10, 1847. They had five children, but their fourth child, Prentiss, drowned in Lake Mendota at age 14.[4] His son, Perley Roddis Sanborn, went on to work at the Northwestern Mutual Life Insurance Company for over 25 years, rising to 2nd Vice President of the company, under the mentorship of Henry L. Palmer, who was a friend of Alden Sandborn.
Politically, Sanborn was a Democrat. He was one of the founders of the Knights Templar lodge in Madison, in 1859, was the first Master of the Masonic Lodge there, and was a leading member of the local Masonic Benefit Association.[4]
He was described as studious and methodical in his legal career, disdaining sloth and disorder. As a judge, he was credited as carefully dispatching the interests of the estates that were brought before his court. However, he was regarded as perpetually melancholy, and may have suffered from depression.[3]
