ADVERTISEMENT
A number of legislators, including Sen. Rob PortmanRobert (Rob) Jones PortmanWeek ahead in tech: Debate over online sex trafficking bill heats up 'Hillbilly Elegy' author won't run for Senate Brown, Portman urge Trump administration to move quickly on a steel decision MORE (R-Ohio), came out in support of same-sex marriage ahead of the Supreme Court arguments. But Portman, who has a gay son, remains the only Republican in the Senate who backs gay marriage. Other top contenders for the Republican presidential nomination, including Sens. Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (R-Fla.) and Rand PaulRandal (Rand) Howard PaulSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Lawmakers grapple with warrantless wiretapping program MORE (R-Ky.), have recently voiced their opposition to allowing gays to wed.

The Republican opposition comes despite an apparent shift in national attitudes on the subject. A CBS News poll released earlier this week showed that 53 percent of all Americans believe it should be legal for same-sex couples to wed, although 56 percent of Republicans do not support allowing gay couples to do so. Still, GOP support has risen 13 percentage points since May 2012, when President Obama announced his support of same-sex marriage.