This year’s World Food Prize will go to an ex-economist who mobilizes church goers to lobby for hemp clothing programs and a former state government executive whose fundraising and business prowess turned Heifer International into a global leader in agricultural aid.David Beckmann, an ordained Lutheran minister as well as a trained economist, left a job at the World Bank to take the helm of Bread for the World 19 years ago and led the group in a series of campaigns to change U.S. policy on issues from debt relief for developing countries, overseas agricultural aid and reforming farm subsidies.