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A number of legislators, including Sen. Rob PortmanRobert (Rob) Jones PortmanGOP leader: Congress may settle for pared-down immigration deal Senate Republicans call on Trump to preserve NAFTA Key senator floats new compromise for immigration talks 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 RubioTrump must send Russia powerful message through tougher actions McCain, Coons immigration bill sparks Trump backlash Taking a strong stance to protect election integrity MORE (R-Fla.) and Rand PaulRandal (Rand) Howard PaulPentagon: War in Afghanistan will cost billion in 2018 Overnight Finance: Senators near two-year budget deal | Trump would 'love to see a shutdown' over immigration | Dow closes nearly 600 points higher after volatile day | Trade deficit at highest level since 2008 | Pawlenty leaving Wall Street group Rand Paul calls for punishment if Congress can't reach a long-term budget deal 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.