Rev. Jim Wallis says hurricane exposed 'social disaster' of poverty | The Rev. Jim Wallis has been advising the Democrats to make poverty their central issue for years, but he says now they're starting to pay attention because Hurricane Katrina exposed disparities in New Orleans to a shocked nation. "Sometimes it takes a natural disaster to expose a social disaster," Wallis said. "The waves of Katrina washed away cities and people, but they may also wash away our public denial of how many people in the country are poor." Wallis, the editor of Sojourners magazine and author of "God's Politics:...