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GOP Senator Says He Will Support Gay Marriage

Conservative constituents attack Sen. Portman for change of heart on gay marriage.
1:39 | 03/16/13

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Transcript for GOP Senator Says He Will Support Gay Marriage
We'll all be watching right here. In the meantime, from a well-known republican in washington. Senator rob portman says had he will support gay marriage after his son told him he's gay. Some of the constituents reacting tonight. My son came to jane, my wife and i, told us that he was gay. That was the moment republican senator rob portman began changing his opposition to same-sex marriage. He's going to make a lot of people in the conservative wing of the republican party quite upset. But for portman, it was not about politics. To have the joy and the stability of marriage that I've had for over 26 years. I want all three of my kids to have that, including our son who is gay. Reporter: That son tweeting, especially proud of my dad today. But there was a backlash from some of the conservative constituents. You're a republican and all of a sudden you're against like gay marriage and stuff, and your son comes out and you want to change your view, that's hypocrite cal. Reporter: Opposition from john boehner in an exclusive interview with martha for this week. Can you imagine yourself in a situation where you reversed your decision on gay marriage if a child of yours or someone you love told you they were gay? I believe that marriage is the union of one man and one woman. It's what I grew up, it's what i believe. Reporter: At the end of the month, the supreme court will take up the defense of marriage act, something that portman originally supported, david. Thank you. To ohio this evening and to american town ripped apart by

This transcript has been automatically generated and may not be 100% accurate.

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