Liz and Mary Cheney Feud Over Gay Marriage on Facebook

Former VP's daughters haven't spoken since Liz came out against gay marriage in her Senate run.
1:52 | 11/19/13

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Transcript for Liz and Mary Cheney Feud Over Gay Marriage on Facebook
Now, to the public feud in the cheney family. The former vice president's two daughters have not spoken to each other since liz came out zens against same-sex marriage in their senate run. But they are speaking out on facebook and tv. And their parents are weighing in. Abc's jeff zeleny has the story. Reporter: A civil war in one of america's most powerful political families. Liz and mary cheney, openly feuding over gay marriage. A dispute very public and personal. Liz, who is running for senate in wyoming, say she's supporting traditional marriage. This is an issue we disagree. Reporter: Those words, offending her younger sister. On facebook, mary responding sharply. This isn't just an issue on which we disagree. You're just wrong and on the wrong side of history. Her wife, heather ppoe, even more direct. When mary and I got married in 2012, she didn't hesitate to tell us how happy it was. Reporter: Now, dick cheney and his wife weighing in. Liz has always believed in the traditional definition of marriage. She as also always treated her sister and her sister's family with love and respect. Public opinion is changing. 58% of americans now support gay marriage. Last year, cheney told abc news' jonathan karl, he was proud of mary and his new daer-in-law. They're an important part of the family for a long time. Provided us with two of our seven grandkids. Reporter: But in kentuc wyoming, liz cheney is making her position clear, creating a deep family rift. For abc news, jeff zeleny, washington. Rob ford, stripped of

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

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