The blue bars are the share of national income earned by the population segments listed at the bottom; the magenta bars are the share those population segments pay of all taxes collected. This actually seems more than equitable, until you remember that the groups on the right enjoy about the highest standard of living of any people who ever lived. From Citizens for Tax Justice via Jonathan Chait.
I like this by Daniel Gross from Newsweek:
If you think it is important to balance the budget (or reduce the deficit), you are going to have to tax rich people who will always howl. And you are going to have to rein in military spending. There are no other measures that will do the job and maintain some semblance of common responsibility for the general welfare.
(Since we're in national budget season, I'm not going to to resist offering occasional short comments on budget matters and process under this headline, just as I have done about health care reform. I have strong foundational views on what the U.S. government ought to be doing about and with taxpayers' money that I've laid out in this post.)