What is a Cause Supporter in FundraisingFish.com? Every Cause has Supporters. If your Cause is a Junior High School Band, then the Cause Supporters are very likely the parents, grandparents and friends of the students in the band. If the Cause is a church, then the Cause Supporters are most likely the congregation. A Cause can have hundreds of Cause Supporters who are Members in FundraisingFish.com. There is one Cause Supporter who enters the information about the Cause that the Supporters will sign up for. This is the Fundraising Leader.