Sixteen months ago, Arthur C. Brooks, a professor at Syracuse University, published “Who Really Cares: The Surprising Truth About Compassionate Conservatism.” The surprise is that liberals are markedly less charitable than conservatives.

Here are some of the findings:

• Although liberal families’ incomes average 6 percent higher than those of conservative families, conservative-headed households give, on average, 30 percent more to charity than the average liberal-headed household ($1,600 per year vs. $1,227).
• Conservatives also donate more time and give more blood.
• Residents of the states that voted for John Kerry in 2004 gave smaller percentages of their incomes to charity than did residents of states that voted for George Bush.
• Bush carried 24 of the 25 states where charitable giving was above average.
• In the 10 reddest states, in which Bush got more than 60 percent majorities, the average percentage of personal income donated to charity was 3.5. Residents of the bluest states, which gave Bush less than 40 percent, donated just 1.9 percent.
• People who reject the idea that “government has a responsibility to reduce income inequality” give an average of four times more than people who accept that proposition.

Brooks demonstrates a correlation between charitable behavior and “the values that lie beneath” liberal and conservative labels. Two influences on charitable behavior are religion and attitudes about the proper role of government.

Brooks gave a talk at the Heritage Foundation in December 2006 where he expanded on his research.