His daughter, Nancy H. Rogers, married Douglas L. Rogers, the son of Secretary of State William P. Rogers.
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He taught Agricultural Economics at the Michigan State University of Lansing from 1944 to 1948, when he became the assistant director and then the director of the Agricultural Experiment Station.
Clifford Evans | Clifford Odets | Clifford Geertz | Tim Hardin | Clifford Jordan | Clifford Harper | Clifford Edmund Bosworth | Clifford Curzon | Clifford Chance | Clifford | William Kingdon Clifford | Max Clifford | Jerry Hardin | Clifford the Big Red Dog | Clifford D. Simak | Baron de Clifford | Ty Hardin | Paul Clifford | Clifford Last | Clifford Grey | Clifford algebra | Baron Clifford of Chudleigh | Wayne Hardin | Nathan Clifford | Natalie Clifford Barney | Hardin County, Tennessee | Hardin County, Iowa | Hardin County | Clifford torus | Clifford Sifton |
Milligan is the daughter of former Secretary of Agriculture, Clifford M. Hardin, and sister of Nancy H. Rogers.
Following the expiration of his term as Secretary of State, Governor Gabriel Slaughter appointed Hardin to the U.S. Senate seat vacated by William T. Barry, who resigned.
In 1851, he married Sarah Ellen (Smith) Hardin, widow of Congressman John J. Hardin (1810–1847).