Note: Among the scattering votes are 11 for "Thomas Corwin." Lieutenant Governor Donnelly was reelected. Donnelly resigned on March 3, 1863 following his election and being seated as U.S. Representative to the 2nd CD in the 1862 cycle. Republican state Senator Henry Swift filled the seat and served from March 4, 1863 to July 10, 1863. At which point Swift succeeded Republican Governor Alexander Ramsey who resigned after being elected to the U.S. Senate. The state was then without a Lieutenant Governor until the next term began on January 11, 1864.
Cowan was an attorney from Traverse des Sioux and a former state Senator (SD 17, 1857-1861).