Democrat Sens. Tom Carper (Delaware) and Mark Warner (Virginia), the authors of the Dodd-Frank Wall Street Reform and Consumer Protection Act’s preemption amendment, recently wrote Treasury Secretary Tim Geithner, expressing surprise and disappointment at the Treasury’s interpretation of the provision. Earlier in the month, George Madison, the Treasury’s general counsel, wrote to the OCC to comment on the agency’s proposed rule on federal preemption, saying that Dodd-Frank’s preemption provision does not uphold the Barnett standard...