Vatican Calls Catholic Politicians Into Line Thu January 16, 2003 09:18 AM ET By Philip Pullella VATICAN CITY (Reuters) - The Vatican told Catholic politicians on Thursday they must oppose laws on abortion, euthanasia and gay marriages and can not accept compromises on Church teachings when formulating policy or legislation. The instructions were contained in new guidelines, which the Vatican said it was publishing now because recent "unsettling" scientific advances, such as embryo research, and social changes had made it necessary to clarify the Church's position again. The document, called "Doctrinal Note on Some Questions Regarding the Participation of Catholics...