Thomas O’Neill, III served as Lieutenant Governor of Massachusetts from 1975-1983. He previously served in the Massachusetts State House of Representatives. He identifies as a Democrat.
1974
–Endorsed Michael Dukakis (D) for Governor of Massachusetts (won)
1978
–Endorsed Edward King (D) for Governor of Massachusetts (won)
1980
–Endorsed Ted Kennedy (D) for President (lost primary)
2020
–Endorsed Joe Biden (D) for President (won)
The Endorsement Project 