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. . . according to George Will, in one of his delightfully statistics-rich articles; this particular one based on data collected by Professor Arthur C. Brooks, and presented in the latter's book, Who Really Cares: The Surprising Truth About Compassionate Conservatism (currently available on amazon in used copies for a ridiculous $1.28 + S&H).
We conservatives always knew this. Perhaps this documented knowledge will become more widely known in time. But since one of the most ironclad rules in the Democratic playbook is to paint conservatives (and Republicans, who are not all conservatives by any stretch) as merciless, greedy, self-absorbed and self-righteous, anti-women, racist, warmongering prudes (and did I mention merciless and greedy?), I suspect it will be quite a long time.