supporter (
http://definr.com/supporter)
n 1: a person who backs a politician or a team etc.; "all their
supporters came out for the game"; "they are friends of
the library" [syn:
protagonist,
champion,
admirer,
booster,
friend]
2: someone who supports or champions something [syn:
patron,
sponsor]
3: a person who contributes to the fulfillment of a need or
furtherance of an effort or purpose; "my invaluable
assistant"; "they hired additional help to finish the
work" [syn:
assistant,
helper,
help]
4: a band (usually elastic) worn around the leg to hold up a
stocking (or around the arm to hold up a sleeve) [syn:
garter]