GOP Sen. Portman comes out in support of gay marriage

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The first sitting Republican U.S. senator to come out in support of same-sex marriage is Rob Portman of Ohio. Portman appeared on CNN Thursday in his only on-camera interview about the "evolution" of his position after his son came out to him as gay two years ago.

In a piece he wrote for the Columbus Dispatch Friday, Portman said, "Ronald Reagan said all great change in America begins at the dinner table, and that’s been the case in my family."

Portman told CNN's Dana Bash that his son, now a junior in college, helped him work through the process of publicly announcing both his change in position and Will Portman's sexuality. "I think he's happy and, you know, proud that we've come to this point, but he let it be my decision."

Portman also said he agrees with British Prime Minister David Cameron, who "supports allowing gay couples to marry because he is a conservative, not in spite of it." The senator said that allowing same-sex marriage is in alignment with the conservative ideals of "personal liberty and minimal government interference in people’s lives."

Rob Portman is sworn in as US Trade Representative in 2005 as his son Will and father Bill look on. Portman became the first sitting Republican senator to publicly support same-sex marriage after son Will, now in college, came out to him as gay two years ago, in 2011. (File/UPI Photo/Roger L. Wollenberg)

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The reversal has been called "stunning," as the prominent Republican has long opposed marriage equality. Portman was in the running to be Mitt Romney's running mate in the 2012 presidential election. Portman says the disclosure about his son's sexuality did not factor into Romney's decision to pick Paul Ryan instead.

Despite his change in position, Portman still believes the issue should be decided by states, not Washington. The senator believes national consensus is already moving toward allowing same-sex marriage. "Judicial intervention from Washington would circumvent that process as it’s moving in the direction of recognizing marriage for same-sex couples.”