The phrase "prominent supporter" refers to someone who is important or well-known and publicly expresses their support for a person, cause, or organization. Full definition
Five years ago, Punjab governor Salmaan Taseer — one of the most prominent supporters of Bibi and critics of the blasphemy laws which sentenced her to death — was assassinated by his bodyguard. (christianitytoday.com)
When Mr. Kelly declined to enter the political arena, Mr. Seabrook went from backing the most prominent supporter of stop - and - frisk to the candidate who wants to see the controversial tactic outright abolished. (observer.com)
Dadey has been an early and prominent supporter for Long, delivering his home county for her at the Republican state convention in Rochester back in March. (nystateofpolitics.com)