For opponents of same-sex marriage, it has been a potent and often repeated talking point: though the courts or the legislatures of some states have given gay and lesbian couples the right to marry, wherever it has appeared on the ballot, voters have rejected it.
Read more in The New York Times: http://www.nytimes.com/2012/10/31/us/politics/gay-marriage-supporters-hope-to-win-in-4-states.html?src=recg