A public feud has erupted between the two daughters of former Vice President Dick Cheney over same-sex marriage. Mary Cheney, who is lesbian and married, has criticized her sister Liz Cheney for opposing the rights of same-sex couples to wed. Liz Cheney is currently seeking a Senate seat in Wyoming. Appearing on Fox News Sunday, she said she believes in the “traditional definition” of marriage and said states should be left to decide whether to recognize same-sex couples. Mary Cheney responded: “You’re just wrong — and on the wrong side of history.”