Warren Buffett

We've heard from plenty of millionaires asking for higher taxes on their incomes. Now, some of the super-rich are asking for higher taxes on their deaths.

A group of 25 entrepreneurs, politicians, academics and wealthy heirs have sent a letter to Congress called "A Responsible Estate Tax Proposal." The letter says that the estate tax is critical to support the country and prevent the rise of powerful family dynasties. They say the tax should be raised to 45 percent and should hit estates valued at $2 million or more, which is more aggressive than the current tax or President Obama's proposal.