Lloyd Blankfein is starting to worry about his legacy. The 55-year-old chief executive of Goldman Sachs — three-plus years into his tenure — recently turned to a Texas corporate p.r. firm to buff the image of the tarnished Wall Street powerhouse. Turning to outside consultants to gauge a firm’s “perception in the marketplace” is unusual for the 140-year-old firm. But that’s what you do, even if you are Masters of the Universe, when the national and international media accuse you of engineering and profiting from a back-door rescue of AIG, of using cash from a taxpayer bailout and cheap Federal Reserve financing to help finance lavish bonuses, and taking down the entire Greek economy.