ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun
: one that uses his power and influence to cause another to become a king ; especially : one that exerts great influence over the selection of candidates for political office
that great kingmaker Warwick — Samuel Daniel
the chief financiers of some campaigns have been persons of great wealth, with no … ax to grind save the desire to be kingmakers — V.O.Key