Excerpt: The federal agency that backstops corporate pension plans reported that its deficit tripled in the last six months, to $33.5 billion. Despite the shortfall, the agency said it has enough assets to pay benefits for many years, even if the holder of one of the largest retirement programs, General Motors Corp., were to file for bankruptcy. The news came as the Pension Benefit Guaranty Corp.'s former director invoked the Fifth Amendment in response to lawmakers' questions about possible mismanagement under the Bush administration. The PBGC's inspector general last week issued a report saying that the former director had violated prohibitions on contacting bidders that were seeking investment contracts.  MORE >>