Charles Cooper -- the pro-marriage discrimination attorney who defended Proposition 8 in front of the U.S. Supreme Court -- says his views are "evolving" on marriage equality after he learned that his daughter is a lesbian.

He is now helping her plan her wedding to another woman.

The AP reports:

The revelation is an unexpected footnote in the years-long debate over Proposition 8, the California measure struck down by the Supreme Court last year. It is also offers a glimpse, through the eyes of one family, of the country's rapidly shifting opinions of gay marriage, with most public polls now showing majorities in favour of allowing the unions. Cooper learned that his stepdaughter Ashley was gay as the Proposition 8 case wound its way through appellate court, according to a forthcoming book about the lengthy legal battle. And with the Supreme Court ruling now behind him, Cooper cast his personal opinion on gay marriage as an evolving process. "My views evolve on issues of this kind the same way as other people's do, and how I view this down the road may not be the way I view it now, or how I viewed it ten years ago," Cooper said in journalist Jo Becker's book "Forcing the Spring: Inside the Fight for Marriage Equality.".. In June, Cooper's daughter plans to marry her partner in Massachusetts, one of 17 states plus the District of Columbia where same-sex marriage is legal. In a statement to The Associated Press, Cooper said his family "is typical of families all across America." "My daughter Ashley's path in life has led her to happiness with a lovely young woman named Casey, and our family and Casey's family are looking forward to celebrating their marriage in just a few weeks," he said.

In a statement provided to the AP, Proposition 8 plaintiffs Kris Perry and Sandy Stier (left) -- who Cooper says inspired his daughter and their family -- welcomed his evolution.

"We were so moved to hear of the Cooper family's constant love and support of their own daughter, even as the Perry case was in full swing and Mr. Cooper was spending his days planning Prop 8's defense," they said. "Some may find this contrast between public and private jarring, but in our opinion, loving an LGBT child unequivocally is the single most important thing any parent can do. We are overjoyed for Ashley and her fiancée, and we wish them the very best."

The wailing and gnashing of teeth from the anti-LGBT right should be coming along anytime now. They're truly losing everyone, folks. What a great time to be alive and working for equality, eh?