The result is a tax system that exempts almost half the country from paying for programs that benefit everyone, including national defense, public safety, infrastructure and education. It is a system in which the top 10 percent of earners — households making an average of $366,400 in 2006 — paid about 73 percent of the income taxes collected by the federal government.

I can’t imagine there has ever been a time in this country before the last couple years when half the population had an effective federal income tax rate of 0%