As Federal Reserve Chairman Ben Bernanke came to testify on Capitol Hill on Wednesday, Sen. Bernie Sanders spoke out about the need for the Fed to limit how much banks may charge their credit card customers. Sanders also said the country’s largest four financial institutions, which now issue two-thirds of the credit cards in America and hold half the mortgages, should be broken up.  The senator made his points during an interview with MSNBC’s Dylan Ratigan about the role banks and Wall Street should play in rebuilding the American economy.