Seems Obama and Buffet both have been a little careless with the facts lately. Who can blame them though with the poll numbers looking the way they are

http://news.yahoo.com/fact-check-ric...070642868.html
Obama's claim hinges on the fact that, for high-income families and individuals, investment income is often taxed at a lower rate than wages. The top tax rate for dividends and capital gains is 15 percent. The top marginal tax rate for wages is 35 percent, though that is reserved for taxable income above $379,150.So what if much of a really wealthy person's income is investment income? AP doesn't get into that; it moves on to discussing the fact that a lot of poor people pay no income tax.
The IRS report shows that in 2008 (the latest year for which data are available), the 400 richest income tax filers paid just 18.1 percent of their adjusted gross income (AGI) in federal income taxes.And this post from the Tax Policy Center tries to explain further:
That is down from 22.3 percent in 2000.
The lower taxes on investment income mean that many high-income taxpayers face a lower ETR [effective tax rate] than middle- and upper-middle-income people who get almost all of their income from working. People in the top 0.1 percent--those with income over $2.18 million in 2011--who get more than two-thirds of their income from gains and dividends face an ETR of just 12 percent, compared with 16 percent for people in the fourth quintile who get less than 10 percent of their income from investments.It's worth recalling that Obama's actual point was this:
They should have to defend that unfairness--explain why somebody who’s making $50 million a year in the financial markets should be paying 15 percent on their taxes, when a teacher making $50,000 a year is paying more than that--paying a higher rate.It is difficult to see what is wrong with that statement. The Associated Press took a seemingly uncontroversial point and, by magic of its "factchecking" machine, turned into an inaccuracy."