Virtually every group in the population is less angry in 2008 than in 1996 -- those making more and those making less than the average income; college-educated and noncollege-educated folks; men and women.
Only one major group in the population has gotten angrier: people who call themselves "very liberal." While conservatives, moderates and nonextreme liberals all have seen their average levels of outrage fall over the past 12 years, the number of angry days among our leftiest neighbors has risen 56% (to 2.28 from 1.46), and the percentage with no angry days in the past week has fallen to 31% from 37%. Today, very liberal people spend more than twice as much time feeling angry as do political moderates. One in seven is outraged seven days a week.
Read the rest of Arthur C. Brooks on levels of anger.