He served as a Member of the Canadian House of Commons from 1935 to 1940 sitting with the Social Credit caucus.
Mitchell first ran for a seat to the House of Commons of Canada as a Social Credit candidate in the 1935 Canadian federal election in the Medicine Hat electoral district.
[1] He would defeat incumbent Member of Parliament Frederick Gershaw to win his first term in office.
He ran in that election under the New Democracy banner, and did not return to federal politics after his defeat.
[2] Mitchell served as a Major with the Royal Canadian Army Service Corps in the 1940s.