From CNN Money: Buffett: Tax my kin, please:
"Without the estate tax, you in effect will have an aristocracy of wealth, which means you pass down the ability to command the resources of the nation based on heredity rather than merit," Buffett told the New York Times in 2001. "[Repeal would be like] choosing the 2020 Olympic team by picking the eldest sons of the gold-medal winners in the 2000 Olympics."
Buffett also joined a campaign in 2001 to preserve the estate tax alongside 119 other wealthy Americans, including George Soros and Bill Gates' father, William H. Gates, Sr..
Typically, fewer than 2 percent of deaths result in estates sizeable enough to be subject to the estate tax. In 2006, for example, less than 1 percent resulted in taxable estates.
For more see my previous post: Estate Tax Reasoning.