Matt Latimer writes:
At first, the film shows [Dick Cheney] lovingly accepting his daughter Mary as she tells him of her sexual orientation and even giving up his presidential aspirations to protect her. But later, in a scene that was clearly invented, the Mary accuses her parents of coldly throwing her under the bus on the issue of gay marriage when it suits their other daughter’s political purposes. The true backstory is this: Liz, running for office in Wyoming in 2013, was being attacked by fellow Republicans for supporting gay marriage, since she had a gay sister. Liz expressed opposition to same-sex marriage, putting her at odds with Mary’s view. While Dick Cheney himself had supported gay marriage since 2000, he issued a statement defending Liz’s differing stance. Same-sex marriage was a difficult topic for many people, so it wasn’t unusual for one daughter to have a different view of it than another and for a parent to still love them both. Not long before that, Barack Obama and the Democratic Party had opposed same-sex marriage, too. It was also perfectly understandable for a father to want to help his other daughter any way he could, and Liz was losing the race badly. This clearly painful, anguishing dilemma is not explained to viewers at all. Instead, we are shown Cheney, looking down absently, while a tearful Mary accuses him of betrayal.