“Liz – this isn’t just an issue on which we disagree, you’re just wrong – and on the wrong side of history,” Mary Cheney, who is gay, wrote on her Facebook page.

Ms. Poe’s comments were sharper and more personal. “Liz has been a guest in our home, has spent time and shared holidays with our children, and when Mary and I got married in 2012 – she didn’t hesitate to tell us how happy she was for us,” Ms. Poe wrote on her own Facebook page. “To have her say she doesn’t support our right to marry is offensive to say the least.”…

“I can’t help but wonder how Liz would feel if as she moved from state to state, she discovered that her family was protected in one but not the other,” wrote Ms. Poe, who called Liz Cheney “my sister-in-law,” adding: “Yes, Liz, in 15 states and the District of Columbia you are my sister-in-law.