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A number of legislators, including Sen. Rob PortmanRobert (Rob) Jones PortmanHarvard biz school honors Wilbur Ross GOP senators blast White House aide over trade remarks Community development impact remains clear with NMTC post-tax reform 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 RubioHillicon Valley: Supreme Court takes up Apple case | Senate votes to block ZTE deal | Officials testify on Clinton probe report | Russia's threat to undersea cables | Trump tells Pentagon to create 'space force' | FCC begins T-Mobile, Sprint deal review Feehery: Betting on Trump Senate votes to block Trump's ZTE deal MORE (R-Fla.) and Rand PaulRandal (Rand) Howard PaulSenate passes 6B defense bill This week: House GOP caught in immigration limbo Amendments fuel resentments within Senate GOP 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.