Sen. Sherrod Brown, D-Ohio, argues that newspapers' editorial boards and bank executives are wrong when they say the issue is not the size of financial institutions but their interconnectedness. "Too big to fail is simply too big," Mr. Brown writes. He notes that the country needs a tough authority to "ensure the orderly liquidation of big banks if they become insolvent." Mr. Brown also argues for size and leverage limits. "It is all about size and risk," he writes.