Lloyd C. Blankfein, the chief of Goldman Sachs who has become a lightning rod for Wall Street critics, might seem an unlikely advocate for same-sex marriage. But his credentials — a public figure in a conservative industry — could make him a powerful voice for that cause. The Human Rights Campaign, a national organization that promotes equal rights for gay, lesbian, bisexual and transgender people, has persuaded Mr. Blankfein to be its first national corporate spokesman for same-sex marriage, an issue that will come up for a legislative vote in several states this year, including Washington and Maryland. Fred Sainz, ... (full story)