While theologian Stanley Hauerwas warns the church to avoid all government involvement, his mentor John Howard Yoder* did not share his reservation. In For the Nations, Yoder encourages the church to be a witness to our government by advocating the gospel to our country’s leaders. He is quick to warn against what he calls the “Constantinian Temptation,” though, and suggests advocates speak from the outside rather than from the center. Martin Shupack, director of advocacy at Church World Service (Washington, D.C.), has built a career doing just this.