Liz Cheney, Mary Cheney, Heather Poe Publicly Feud Over Gay Marriage Liz Cheney speaks during a campaign appearance in Casper, Wyoming, Wednesday, July 17, 2013. Everyone must be looking forward to Thanksgiving at the Cheney house. Former vice president Dick Cheney's daughters have found themselves at the center of the culture wars again, when Mary Cheney and her wife chided Liz Cheney for opposing gay marriage during a nationally televised interview Sunday. Republican U.S. Senate candidate Liz Cheney said she disagreed with her younger sister's decision to marry her longtime partner Heather Poe in an interview on Fox News Sunday, leading Poe to publicly express her disappointment with her sister-in-law via Facebook. "When Mary and I got married in 2012 - [Liz] didn't hesitate to tell us how happy she was for us," wrote Poe. To have her now say she doesn't support our right to marry is offensive to say the least. Mary Cheney shared her partner's Facebook message, adding: "Liz - this isn't just an issue on which we disagree - you're just wrong - and on the wrong side of history." Liz Cheney's stance on gay marriage has been a source of debate in her campaign for U.S. Senate in Wyoming, where a super PAC ran an ad questioning her conservative views on the issue. The Washington Post