What is the fine-grained topic of the following text: It is also possible that the Fertitta brothers might have chosen to support Giuliani on the basis of their gambling interests (presumably for the same reasons as Adelson) and simply choose to make the contributions through Zuffa in an attempt remain low key (notice that the article does not make the connection of Zuffa to the Fertittas and Station Casinos). Only return the topic.
Fertitta brothers' potential motives for supporting Giuliani through Zuffa.