Jonathan Last's lengthy article for The Weekly Standard on the rise of singlehood in America is well worth the read, particularly towards the end where he offers this suggestion:
Rather than entering a bidding war with the Democratic party for the votes of Julias, perhaps the GOP should try to convince them to get married, instead. At the individual level, there’s nothing wrong with forgoing marriage. But at scale, it is a dangerous proposition for a society. That’s because marriage, as an institution, is helpful to all involved. Survey after survey has shown that married people are happier, wealthier, and healthier than their single counterparts. All of the research suggests that having married parents dramatically improves the well-being of children, both in their youth and later as adults.
As Robert George put it after the election, limited government “cannot be maintained where the marriage culture collapses and families fail to form or easily dissolve. Where these things happen, the health, education, and welfare functions of the family will have to be undertaken by someone, or some institution, and that will sooner or later be the government.” Marriage is what makes the entire Western project—liberalism, the dignity of the human person, the free market, and the limited, democratic state—possible. George continues, “The two greatest institutions ever devised for lifting people out of poverty and enabling them to live in dignity are the market economy and the institution of marriage. These institutions will, in the end, stand or fall together.”
Instead of trying to bribe single America into voting Republican, Republicans might do better by making the argument—to all Americans—that marriage is a pillar of both freedom and liberalism. That it is an arrangement which ought to be celebrated, nurtured, and defended because its health is integral to the success of our grand national experiment. And that Julia and her boyfriend ought to go ahead and tie the knot."