Polls show that about half of Americans approve of allowing gay and lesbian couples to marry. But among Republicans, that percentage drops sharply. This week a public rift in the family of former Vice President Dick Cheney thrust the issue onto the front page again. One of Cheney’s daughters is married to a woman. The other, Liz Cheney, is running for office on the Republican ticket in Wyoming. On national TV over the over the weekend, Liz Cheney said she believes in the traditional definition of marriage. That puts her in line with most other Republicans –- but not most other Americans. Diane and her guests discuss changing perspectives on same-sex marriage.