What voting block is most important in republican politics?

As a small business owner, I would say that people who have worked very hard and have a vested interested in hard-work-based growth of this nation have a great tendency to vote Republican. Also important is the flip-side of this answer: People with no interest in hard work or the growth of prosperity have a tendency to vote for Democrats. (this is not purely indicting to the poor, as I would venture to say that those of vast inherited wealth have a tendency to be liberal in correlative fashion equal to the amount of work they have invested in their own financial statuses...)