One of the America's richest men, Warren Buffet, recently complained that he wasn't paying enough tax. He pointed out that he was paying a lower marginal rate than his secretary.
Fair enough, said arch conservative Senator Mitch McConnell, if you are feeling guilty, send in a cheque. Another Republican Sentator, John Thune, sought to introduce a new column on tax returns to allow the rich the option of paying more to help ease the national debt.
Now it looks as though Mr Buffet (worth around $45bn) is going to call the Republican bluff. He's offered to match every contribution that the Republican senators give, dollar for dollar. And he's prepared to make a special case for Senator McConnell, paying $3 for every $1 from the politician.
Somehow I have a feeling that Mr Buffet is going to keep his money in his pockets.