What is a Fundraising Leader in FundraisingFish.com? A Fundraising Leader is a Cause Supporter who is the primary advocate for the Cause in FundraisingFish.com. A Fundraising Leader manages the Cause’s information on FundraisingFish.com. For example, often times we see one parent or a teacher acting as a Fundraising Leader for a school group. The Cause Leader is typically the person who will inform potential Cause Supporters of the FundraisingFish.com service.