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A number of legislators, including Sen. Rob PortmanRobert (Rob) Jones PortmanJD Vance raises more than million in second fundraising quarter for Ohio Senate bid Cleveland Plain Dealer urges Portman to reconsider retirement Johnson, Thune signal GOP's rising confidence 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 RubioHow a nice-guy South Dakota senator fell into a Trump storm Republicans threaten floor takeover if Democrats weaken filibuster  Democrats must close the perception gap MORE (R-Fla.) and Rand PaulRandal (Rand) Howard PaulTrump slams Biden, voices unsubstantiated election fraud claims at first rally of 2022 Overnight Energy & Environment — Lummis holds up Biden EPA picks Photos of the Week: Voting rights, former Sen. Harry Reid and snowy owls 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.