JACKSON, Miss. — In mid-September, Howard Sanders bumped down pothole-ridden streets in a white Cadillac weighed down with water bottles on his way to a home in Ward 3, a neglected neighborhood that he called “a war zone.” Sanders, director of marketing and outreach for Central Mississippi Health Services, was then greeted at the door by Johnnie Jones. Since Jones’ hip surgery about a month ago, the 74-year-old had used a walker to get around