President Obama, during a brief Rose Garden press conference meant to announce his nominee for World Bank president, ventured into the high-intensity controversy over the unarmed black teenager fatally shot in Florida -- calling the case a "tragedy" and saying if he had a son, "he'd look like Trayvon." The death of Trayvon Martin, 17, is now under investigation by the Justice Department and FBI. Obama, asked about the case Friday, noted that he doesn't want to interfere with the probe being led by his attorney general, Eric Holder. But he made clear that he empathizes deeply with the parents...