Donald Riegle represented Michigan in the U.S. Senate from 1976-1995. He previously served in the U.S. House of Representatives. He identified as a Democrat but identified and served as a Republican before 1973. He died in 2026.
1968
–Endorsed George Romney (R) for President (lost primary)
1980
–Endorsed Jimmy Carter (D) for President (lost general election)
2016
–Endorsed Bernie Sanders (D) for President (lost primary)
2020
–Endorsed Bernie Sanders (D) for President (lost primary)
The Endorsement Project 