Last week, at a House hearing on financial institutions and consumer credit, Republicans lined up to grill and attack Elizabeth Warren, the law professor and bankruptcy expert who is in charge of setting up the new Consumer Financial Protection Bureau. Ostensibly, they believed that Ms. Warren had overstepped her legal authority by helping state attorneys general put together a proposed settlement with mortgage servicers, which are charged with a number of abuses. But the accusations made no sense. Since when is it illegal for a federal official to talk with state officials, giving them the benefit of her expertise? Anyway, everyone knew that the real purpose of the attack on Ms. Warren was to ensure that neither she nor anyone with similar views ends up actually protecting consumers.