Minnesota Senator Paul Wellstone will tour several towns in the Mississippi Delta today ... in the first part of what he's billing as a nationwide poverty tour. Over the coming weeks, Wellstone plans to retrace the steps of Robert Kennedy... who visited some of the country's poorest regions in 1967 and '68. Minnesota Public Radio's John Biewen reports on how poverty has... or has not... changed... in the past thirty years. When Senator Robert Kennedy traveled to the Mississippi Delta in 1967... he found children in tattered clothing... with no access to a doctor and, in some cases, not enough to eat. Their parents had lost their cotton-plantation jobs to mechanization. A few months later... Kennedy found similar conditions among displaced coal mining families in eastern Kentucky. Georgetown