Democrats form groups. Republicans form groups. Party groups of both parties get money from their national party and other groups whose specific reason to exist is to raise money. Both parties have rich members who donate money to the national group and individual groups. Democrat groups will try to defeat Republicans. Republican groups will try to defeat Democrats. Clinton is a Democrat - she can raise money, start groups, just like so-called Republican Trump can raise money and start groups. Rich people of both parties can form their own groups and raise money, spend money. That is the way it works. It would only be unusual if groups were not formed by either party.