One of the straightest paths this country could take toward Bank Bailout 2, the Sequel, would be through forcing financial institutions to buy back the lousy mortgage-backed securities they sold before the meltdown. Large-scale buybacks could open gaping wounds on bank balance sheets, a risk Bank of America (BAC) is particularly vulnerable to because it swallowed Countrywide's gigantic -- and now infamously fraudulent -- mortgage machine. Regardless of that risk, banks should have to follow the rules of their contracts, and the law. But getting BofA to buy back its mortgage junk won't be easy. As of June 30, 2010,...