Whatever the Supreme Court decides, social conservatives active in the Republican Party are vowing to leave tough language opposing same-sex marriage in the GOP's 2016 platform.

But a group of establishment GOP leaders wants to drop the language, believing it hurts the party with young people and some other voters.

And CNN is told they hope Sen. Rob Portman of Ohio will take a lead role in reshaping the platform.

Why Portman?

Well, for starters the platform will be debated and adopted in his home state of Ohio. The Republican convention is in Cleveland.

More significant, though, is the senator's personal journey on the issue. Portman switched to become a supporter of same-sex marriage in 2013. He said at the time he was swayed by his son, Will, who told his parents in 2011 that he is gay.

Taking a lead role in such a platform battle would be a huge challenge for Portman, who is also up for re-election in 2016.

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