Mary Cheney, the openly gay daughter of former Vice President Dick Cheney, argued Wednesday that gay marriage is a conservative value.

Cheney spoke at a fundraiser in Indianapolis for Freedom Indiana, the umbrella group working to derail a proposed constitutional amendment to the Indiana Constitution which would prohibit the state from recognizing any union other than a heterosexual marriage.

“Now, this may come as a shock to some of you, but I'm pretty conservative,” Cheney told a group of about 100 supporters, the AP reported. “As a conservative, I also believe that strong families are the cornerstone of our society, and that we as a society need to do everything we can to ensure that all families are provided the greatest opportunity. I believe that all families – regardless of how they look, or how they're made, or where they live – that all families deserve to be treated with the same respect, rights and legal recognition.”

“This isn't about marriage equality,” she said. “This is about standing up and opposing an amendment that would hurt Indiana's economy, impact the state's future development, and potentially devastate many of the state's families.”

Cheney's participation comes after a public feud on the subject with her sister Liz Cheney, an opponent of marriage equality and a Republican candidate for the U.S. Senate.

(Related: Mary Cheney “not supporting Liz Cheney's candidacy.”)

House Joint Resolution 6 (HJR-6) sailed through the Republican-controlled General Assembly in 2011. A second voted needed before it can go to voters is expected to take place early next year.