Mary Cheney, daughter of former Vice President Dick Cheney, has joined a bipartisan effort against adding a constitutional ban on same-sex marriage to Indiana’s constitution.

In a fundraising email for the group, Freedom Indiana, Cheney, who is married to her partner, writes that “no one should be denied the fundamental liberties we all deserve.”

“That’s why when I heard about HJR-6 — the proposed constitutional amendment that would permanently ban all protections for same-sex couples and their families — I knew I had to join the powerful bipartisan movement that’s working to stop this anti-freedom amendment,” Cheney goes on to write in the fundraising email.

Cheney also plans to host a reception in Indianapolis on behalf of Freedom Indiana.

Cheney has also criticized her sister, Liz, who’s running for Sen. Mike Enzi’s (R-WY) Senate seat, for her opposition to gay marriage. The intrafamily feuding has become increasingly visible in the public sphere and Mary has said she does not plan to see her sister over the holiday season.