The Obama administration's proposal to fund a consumer financial protection agency with fees charged to big banks is smart on two counts: Economically, it helps temper the advantages enjoyed by financial institutions considered too big to fail, thereby discouraging their growth to dangerous levels; and politically, it goes a long way toward securing the support of smaller banks that have staunchly opposed a consumer agency on the grounds that it would further disadvantage them. The idea is also supremely fair, despite protests to the contrary from the Financial Services Roundtable, which represents large firms.