From the Washington Post:

NEW YORK, June 26 — Warren E. Buffett was his usual folksy self Tuesday night at a fundraiser for Senator Hillary Rodham Clinton (D-N.Y.) as he slammed a system that allows the very rich to pay taxes at a lower rate than the middle class.

Buffett cited himself, the third-richest person in the world, as an example. Last year, Buffett said, he was taxed at 17.7 percent on his taxable income of more than $46 million. His receptionist was taxed at about 30 percent.