The Supreme Court hears arguments Tuesday about whether same-sex couples have the constitutional right to marry, and this has thrust the issue back into the spotlight - and the 2016 presidential campaign.
A February CBS News poll found that 60 percent of Americans say it should be legal for same-sex couples to marry. That's up from 46 percent in November 2012, and the percentage of people who believe it should not be legal has dropped to 35 percent today from 41 percent on November 2012.
But the Republicans running for president or who are expected to run say they still support the view that a marriage should be between a man and a woman. Some have taken a milder tone and say that they would attend the wedding of a friend or family member who was gay, even if they didn't believe they should be getting married.
Democrats, on the other hand, are more likely to have embraced marriage for gay and lesbian couples.