I think Laurence Lewis at KOS nailed it:
The big Republican donors tend not to be the social warfare types, rather they tend to be the obscenely wealthy who are obscenely worried about having to pay more taxes. Because even though they have more money than they and future generations of their most dissolute progeny would be able to spend on even their most lavishly ostentatious excesses, they don't want to have to contribute in any way to making life easier for the poor, the hungry, the homeless, and the otherwise disadvantaged.
