Andrew Lintner Harris, who died on September 13, 1915 (born 1835), was a running mate of William McKinley. Not, as it happens, when McKinley ran for president, perhaps because Harris and McKinley were both from the same state, Ohio. Rather, Harris ran for lieutenant governor of that state when McKinley ran for governor, in 1892 and 1894. They were victorious in both elections.
Harris was lieutenant governor again beginning in 1906, and became the 44th governor of Ohio when Gov. John M. Pattison died in office later that year. Harris had served the Union cause as a general -- playing an important part in the Battle of Gettysburg -- thus becoming the last Civil War general to serve as a state governor.