A new Gallup survey finds that 54% of voters who are married support Mitt Romney, while 56% of those who are not married back Barack Obama.
Married voters have backed the Republican nominee in every election dating back to 1996, while nonmarried voters have been behind the Democratic nominee:

Married Americans constitute an important part of Republican nominee Romney's voter coalition, and his ability to win the votes of a large portion of this group is crucial to his election hopes. Gallup estimates show Romney currently enjoys support among married voters similar to that of other Republican presidential candidates since 2000; in all instances, married voters were more likely to support the Republican candidate.

