The incumbent Governor, James T. Lewis, refused nomination for re-election.
The American Civil War had concluded just a few months before this election was held; both major party candidates in this election were retired brigadier generals who had served with distinction in the war.
Nominations
Republican (Union) party
Lucius Fairchild was the incumbent Wisconsin Secretary of State at the time of the 1865 election, having been elected in the 1863 election on the Democratic Party ticket. Fairchild was one of the first Wisconsin men to volunteer for service in the Union Army, rising from captain to colonel with the 2nd Wisconsin Infantry Regiment in the famous Iron Brigade in the eastern theater of the war. He led the regiment in fierce fighting during the first day of the Battle of Gettysburg. At Gettysburg, Fairchild was wounded and captured. He was quickly released from captivity, but his left arm had been crushed and had to be amputated. He returned to Madison to recuperate, and was then nominated for Wisconsin Secretary of State. President Lincoln awarded him an honorary promotion to brigadier general.
^Joint Committee on Legislative Organization, Wisconsin Legislature (2015). Wisconsin Blue Book 2015–2016. Madison, Wisconsin: Wisconsin Department of Administration. pp. 699–701. ISBN978-0-9752820-7-6.
^ abWisconsin Historical Society, Tabular Statement of the votes polled in the several counties of the State of Wisconsin, at an election held on the seventh day of November 1865. for State Officers, and on the proposition to amend the Constitution of said State