With his chronically gravelly voice and relentlessly liberal agenda, Sherrod Brown seems to have stepped out of “Les Miserables,” hoarse from singing revolutionary anthems at the barricades. Today, Ohio’s senior senator has a project worthy of Victor Hugo — and of conservatives’ support. He wants to break up the biggest banks.

He would advocate this even if he thought such banks would never have a crisis sufficient to threaten the financial system. He believes they are unhealthy for the financial system even when they are healthy. This is because there is a silent subsidy — an unfair competitive advantage relative to community banks — inherent in being deemed by the government, implicitly but clearly, too big to fail.