Infanticide is already banned under the partial birth abortion act. It should not have been an issue in this election. Obama promised changes to include more kinds of abortion in the ban in exchange for putting in more specificity on which trimesters reply, but the right wingers would have none of it (and gory D&E abortions continue). No one in the Church disputes that abortion is wrong, although I know they occur among Catholic HS girls who get pregnant and whose parents want to cover up their children's sexual activity. As for marriage, the Church is just wrong. Doctrine state that marriage is made by the couple, not the Church and that functionality rather than fecundity is required (it must be a sexual union - that some don't like how some perform thist is none of the business of a celibate clergy, including when heteros do the same things). Both are moral and therefore natural law teachings, not covered under the Syllabus on Modernism. Marriage is about practice therefore mutable.