Isaac Thorn Bishop, Sr., (June 6, 1844 – July 20, 1920) was an American farmer and Republican politician from Kenosha County, Wisconsin.

[1] He left that job in the Summer of 1862, when he volunteered for service in the Union Army in the midst of the American Civil War.

[2] He saw extensive combat during the Vicksburg Campaign, and wrote an account of the Battle of Arkansas Post in a letter to his sister in 1863.

[1] Bishop faced another challenging primary in 1910, opposed by Charles H. Everett of Racine, the editor of the Wisconsin Agriculturist.

[6] This was an era of significant division within the Republican Party between progressive and stalwart factions, and while Everett did not openly declare for either side, Bishop was a self-described progressive who declared his support for the re-election of U.S. senator Robert M. La Follette.

His eldest son, John, died in his 30s after falling from a stationary train car and hitting his head.

[13] And Edwin suffered a fatal heart attack at age 35 while working as a professor at the University of Chicago.

Near the end of his life, he claimed to own one of the three original drafts of the United States Declaration of Independence, which he planned to donate to the Smithsonian Institution.