From Wikipedia:
Warren Edward Buffett (born August 30, 1930) is an American business magnate, investor, and philanthropist. He is widely considered the most successful investor of the 20th century.
Buffet is the primary shareholder, chairman and CEO of Berkshire Hathaway [5] and consistently ranked among the world's wealthiest people. He was ranked as the world's wealthiest person in

2008
[6] and as the third wealthiest person in 2011.
[7]
In 2012, American magazine Time named
Buffett one of the most influential people in the world.
[8]
The Buffett Rule is a tax plan proposed by President Barack Obama in 2011.
[1] The tax plan would apply a minimum tax rate of 30 percent on individuals making more than a million dollars a year.
[2][3]
According to a White House official, the new tax rate would impact 0.3 percent of taxpayers.
[1]
The Buffett Rule is named after American investor Warren Buffett, who publicly stated in early
2011 that he disagreed with rich people, like himself, paying less in federal taxes, as a portion of income, than the middle class, and voiced support for increased income taxes on the wealthy.
[4]
The rule would implement a higher minimum tax rate for taxpayers in the highest income bracket, to ensure that they do not pay a lower percentage of income in taxes than lessaffluent Americans.
[5]
Excerpt from: Obama: "This is not class warfare -- It's math" STEPHANIE CONDON /CBS
NEWS/ September 19, 2011, 11:20 AM
"This is not class warfare -- it's math," Mr. Obama said from the White House Rose Garden, addressing GOP critiques of his plan head on.
"The money has to come from some place," he continued. "If we're not willing to ask those who've done extraordinarily well to help America close the deficit... the math says everybody else has to do a whole lot more, we've got to put the entire burden on the middle class and the poor."
The core of Mr. Obama's deficit reduction plan is $1.5 trillion in new taxes. About $800 billion comes from repealing the Bush-era tax rates for couples making more than $250,000. The plan also closes certain corporate tax loopholes and limits certain tax deductions.
The president is also putting forward a measure he's calling the "Buffett Rule" -- named for billionaire investor Warren Buffett -- to compel those making $1 million or more a year to pay the same overall rate as other taxpayers. Taxpayers making $1 million or more often make their fortune through investment income, which is taxed at 15 percent; the top income tax rate is 35 percent.
Even before the president unveiled it Monday, Republicans on Capitol Hill were declaring the president's deficit reduction plan dead. On Sunday, House Budget Committee Chairman Paul
Ryan said Mr. Obama's plan signaled the president is too focused on his own re-election. "He's in a political class warfare mode and campaign mode. And that's not good for our economy," Ryan said.

In response, Mr. Obama said, "I reject the idea that asking a hedge fund manager to pay the same tax rate as a plumber or teacher is class warfare. I think it's just the right thing to do."
Excerpt from Washington Post, 9/30/2011
`There’s been class warfare for the last 20 years, and my class has won’
By Greg Sargent
People obsessing over Warren Buffett’s comments on CNBC today are focusing on the wrong
Warren Buffett interview. These remarks from Buffett, on CNN this morning, are far more significant:
QUESTIONER: Are you happy seeing your suggestion, this new Buffett Rule, becoming more of a basis of a political battle that really has turned into class warfare?
BUFFETT:
Actually, there’s been class warfare going on for the last 20 years, and my class has won. We’re the ones that have gotten our tax rates reduced dramatically.
If you look at the 400 highest taxpayers in the United States in 1992, the first year for figures, they averaged about $40 million of [income] per person. In the most recent year, they were $227 million per person — five for one. During that period, their taxes went down from 29 percent to
21 percent of income.
So, if there’s class warfare, the rich class has won.