The phrase "enthusiastic promoter" refers to a person who actively supports and encourages something or someone with great excitement and passion. Full definition
The press was (and still is) happy to accept without challenge a statement made by a medical man who, as one of the most enthusiastic promoters of ultrasound, can hardly be unbiased. (drmomma.org)
It is now hard to imagine «even the most enthusiastic promoters of ID cards» still see their introduction as a good idea, Mr Carmichael concluded. (politics.co.uk)
Since SYNC's inception, many public libraries, teachers, and school librarians have become enthusiastic promoters of the annual event. (noshelfrequired.com)