Touchstone calls it like it sees it in this month's issue. Please read what is available online, when you have the time. And this, by way of a teaser:
Christians are not the only ones in a position to understand what Augustine and Leo XIII and Paul VI understood—that marriage resides at the very foundation of culture. They are not the only ones who have reason to be concerned about the bastardization of the citizenry through same-sex marriage, or about the Kulturkampf that threatens to leave behind it a moral wasteland blanketed by impenetrable judicial thickets. They are not the only ones capable of standing for freedom. Christians may, however, be the only ones capable of standing against contraception, which is their particular duty.
Douglas Farrow, "Why Fight Same-Sex Marriage?," Touchstone Jan/Feb 2012