Bob Rubin and Julian Robertson have clearly come to the happy conclusion that, having lived through the first eight months of the year, both of them are likely to survive well into 2011 and beyond. But they want to tax their fellow plutocrats who aren’t so lucky, by bringing back the estate tax for the remainder of 2010, and even trying to make the tax retroactive to January.

That’s a good idea, of course. It’s ludicrous that the estate tax is at zero this year. But it’s not going to be easy to pass a retroactive tax, especially when its biggest cheerleaders are these two guys: the person most to blame for the global financial crisis, and a hedge-fund billionaire who carefully skirts residency requirements to avoid paying millions of dollars in...