The Weekly Standard reports:
You don’t hear nearly as much about the rise of single voters, despite the fact that they represent a much more significant trend. Only a few analysts, such as Ruy Teixera, James Carville, and Stanley Greenberg, have emphasized how important singletons were to President Obama’s reelection. Properly understood, there is far less of a “gender” gap in American politics than people think. Yes, President Obama won “women” by 11 points (55 percent to 44 percent). But Mitt Romney won married women by the exact same margin. To get a sense of how powerful the marriage effect is, not just for women but for men, too, look at the exit polls by marital status. Among nonmarried voters—people who are single and have never married, are living with a partner, or are divorced—Obama beat Romney 62-35. Among married voters Romney won the vote handily, 56-42.
There's more:
Back in 2010, Teixera noted that 47 percent of all women are now unmarried, up from 38 percent in 1970. “Their current size in the voter pool—more than a quarter of eligible voters—is nearly the size of white evangelical Protestants, who are perhaps the GOP’s largest base group,” he writes. “And since the current growth rate of the population of unmarried women is relatively high (double that of married women), the proportion of unmarried women in the voting pool should continue to increase.” In the medium run, he’s almost certainly correct.
An article well worth your time.