Bishops who make a case for one-issue politics or openly oppose a political candidate are in violation of the guidelines set out repeatedly in their own documents on political responsibility, said noted theologian Fr. Richard McBrien in a recent talk here. 1. Although bishops and other Catholic officials have the constitutional right to participate in public policy debates and in the political process generally, they impose certain limits upon themselves as a matter of prudence. 2. Catholic voters and their bishops should examine the positions of the candidates on the full range of issues as well as their integrity, philosophy and performance. 3. Catholic voters and their bishops must not forget the distinction between moral principles and their application in the political order. It is possible to agree on an important moral principle and yet disagree, in good conscience, on the way that principle is applied in the political order. 4. Because there is a distinction between the moral law and the civil law, Catholics and others--Christians and non-Christians alike--cannot expect that every element of the moral law, as they understand it, can or should be translated into civil law. 5. Given the principle of sacramentality, in the final analysis the most effective way for the church and its members--or for anyone--to influence public policy is by force of their own example.