Washburn won election to the
Massachusetts Senate in 1850 and served two years in the
Massachusetts House of Representatives from 1853 to 1855. His elections to the state legislature were supported by proponents of the
Hoosac Tunnel. He was viewed as relatively moderate, in comparison to the mostly
Radical Republican Massachusetts delegation. He served as chairman of the
Committee on Claims during the 41st Congress. and a number of well-known politicians vied for the party nomination to replace outgoing Governor
William Claflin. Most prominent was the former Congressman and
American Civil War general
Benjamin F. Butler, who was disliked by the fiscally conservative state Republican establishment over his support for the continued issuance of
greenbacks (currency not backed by silver or gold), and who frequently used populist tactics to upset convention proceedings. Butler's opponents eventually united behind Washburn to give him the nomination, and he won the general election by a 13,000 vote margin over
John Quincy Adams II and a labor candidate. He was reelected to further terms in 1872 and 1873, the former despite dissension in Republican ranks that had resulted in the splitting off of the
Liberal Republican Party, who fielded Francis W. Bird. The 1873 convention was particularly affected by the actions of Butler supporters, but Washburn prevailed and was again comfortably reelected. Washburn's three victories over Butler in these conventions marked a low point in the latter's career. The major event of 1872 during Washburn's tenure as governor was the
Great Boston Fire of 1872, which destroyed of prime commercial real estate in the city on November 9. The legislature was called into a special session to enable the provision of state assistance. Measures it passed included a bill simplifying the establishment of insurance companies, since several were bankrupted by the blaze, and a bill authorizing the city to issue bonds to speed the rebuilding effort. 1873 brought a new round of state funding in the amount of $200,000 to fund the final completion of the Hoosac Tunnel, a tightening of the state's alcohol prohibition laws, and the establishments of a new prison in
Concord (now
MCI Concord) and a mental hospital in
Salem. In 1874, Washburn signed legislation establishing a women's reformatory. Although Washburn was a supporter of
women's suffrage, the matter was not seriously considered by the legislature during his term. He also supported legislation reforming the state's child labor and education laws, which were widely flouted. He opposed enactment of a labor bill limiting work to ten hours per day, a subject of regular labor agitation during his tenure. When United States Senator
Charles Sumner died in March 1874, the state senate, which then chose the state's US senators, met to choose his replacement. After a long and contentious debate involving thirty-three ballots, Washburn was chosen to succeed Sumner as a compromise candidate acceptable to supporters of
Henry L. Dawes and
George F. Hoar. Washburn then resigned the governorship, leaving Lieutenant Governor
Thomas Talbot as acting governor. Washburn served from April 17, 1874, until the term ended on March 3, 1875, and refused to run for reelection. ==Other activities==