Smith also points out that gay marriage is not as much a partisan issue as a religious one.
"With the exception of Iowa, if you look at the states that have legalized gay marriage, they are some of the least religious states in the country," he says. States that have legally sanctioned gay marriage are New Hampshire, Vermont, New York, Connecticut, Iowa and Massachusetts. Washington and Maryland have passed laws allowing it that are facing voter approval in the fall and in Maine voters will also weigh in on a citizens' initiative to legalize it.
Meanwhile, 30 states have passed constitutional amendments banning gay marriage and in all 32 instances that the question has been put to voters for popular approval it has failed.
A Pew Research Center Survey pegs support at 47 percent in 2012, up from 35 percent in 2001.
- Vote now on whether or not gay marriage should be legal nationally
- Read: Rumors swirl on Obama 'evolution' on gay marriage
- Follow U.S. News Debate Club on Twitter
Rebekah Metzler is a political writer for U.S. News & World Report. You can contact her at email@example.com or follow her on Twitter.