A new report from two watchdog groups says 18 of this country’s wealthiest families have been behind a multi-million dollar lobbying campaign to repeal the federal estate tax. According to Public Citizen and United for a Fair Economy, the families have directely funded campaigns and set up shadow associations to spread misleading information on the benefits of repealing the tax. The groups say a repeal of the estate tax would save the families over $71 billion dollars. The families include those behind the companies Wal-Mart, Campbell’s soup, and Mars Incorporated. Joan Claybrook of Public Citizen called the campaign “one of the biggest con jobs in recent history.”