AN ORGANIZATION THAT NORMALLY WELCOMES press coverage of its bustling worksites and sweating volunteers, Habitat for Humanity has spent recent months in the awkward role of media target. News reports have tracked every move in a seedy executive-suite scandal that led to the January firing of the 29-year-old nonprofit's founder and president Millard Fuller over accusations of sexual harassment. It wasn't the first time Fuller's hand had been slapped. When charges of unwelcome kissing and groping of female employees reached the organization's board in the early '90s, the evangelically-aligned group's most prominent supporter, former president Jimmy Carter, intervened on behalf...