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FILE - In this July 17, 2013, file photo, Liz Cheney speaks during a campaign appearance in Casper, Wyo. Cheney, the elder daughter of former Vice President Dick Cheney, announced her GOP primary challenge to Wyoming's senior U.S. incumbent Sen. Mike Enzi. The dispute roiling one of the most prominent families in the Republican Party highlights a central factor in the growing acceptance of legal same-sex marriage: Knowing someone who’s gay. Mary Cheney is married to a woman and also the daughter of former vice president Dick Cheney and sister to Liz Cheney, who is running for the Republican nomination for the U.S. Senate from Wyoming. Mary’s father has said he supports legal gay marriage in states where it is recognized. Since mounting her bid, Liz Cheney has said she opposes gay marriage.  (AP Photo/Matt Young, File) Matt Young/AP