The Obama 2012 campaign has put up a "Life of Julia" website that explains how the Obama Administration would provide cradle to grave welfare state benefits for an apparently never-married single mother named Julia, who would be financially crazy to vote Republican.
It's hard to disagree with Obama's logic, and indeed, being a single woman appears to be an extremely strong causal driver of voting Democratic in Presidential elections. In contrast, little changes a woman's mind about how to vote more than marriage.
Hence, it would make sense for the GOP to research the reasons for voters not getting married and propose reforms to make family formation more affordable. In other words, logically, it's in the Republican Party's self-interest to think about how to make American citizens happy and how to encourage them to grow more happy American citizens of their own.
Obviously, when phrased that way, you can understand why the GOP Brain Trust has paid no attention whatsoever to this question since I first brought it up seven years ago. It's just crazy talk!