 The head of the Social Security Administration is calling for an overhaul of a program that provides benefits to several million disabled and elderly people with little income. NPR's Joseph Shapiro reports. An NPR investigation of Supplemental Security Income, or SSI, found the anti-poverty program is troubled by complex and out-of-date rules. Martin O'Malley, the commissioner of the Social Security Administration, agrees that the program needs to be modernized.