That's really not the case at all. I suspect that a person's voting tendencies are largely a function of how they view work, personal finance, and the pernicious effects of taxation. Someone who can aptly be described as "idle rich" is far more likely to vote Democrat because these folks no longer see a direct correlation between work effort and personal income. The current generation of the Kennedy family is a good example of this. They -- like many other people who came into a lot of money without earning it -- espouse radical left-wing politics simply because they are bored to tears and look upon meddling in the lives of ordinary Americans as the only means of having any real purpose in life.
Are you for inheritance/estate tax then? BTW, how the previous generations of Kennedies earned their wealth?