Chelsea Clinton sat inside a waiting room Thursday at the Napa County Health and Human Services Agency. But it wasn’t a bare and boring area like those typical of government offices. Instead, it was bright and playful, complete with rows of books and language-related material to explore. Clinton, the former first daughter and vice chair of the Clinton Foundation, was there to celebrate the success of the special pilot project that had helped transform that stark waiting room into something beneficial to children and families. “We so fundamentally believe that every child and every parent and other caregiver of young...