You're way out of date. I realize that's a generally applicable criticism, but it's also tremendously applicable in this instance.
The other NOM, the National Organization for Marriage, used to crow about this line constantly. That was the stock anti-gay talking point, how the American public had never voted in favor of gay marriage. That was always the lead comment from Maggie Gallagher, Brian Brown, and all their friends. It went something like, "The American public has voted on gay marriage 32 times and every time they've rejected it." (I can't remember if it was 32 or 31.)
The refrain was getting pretty tiring. And then suddenly it vanished in 2012. It was no longer their lead statement. It was almost entirely ignored from that point forward.
What happened is that the tipping point was reached in November 2012. Prop 8 in California was pretty close -- 52-48%. Right up until the end there was hope that one would tip the other way. In 2000, the predecessor to Prop 8, the Knight Initiative had passed by 69-31%. Clearly public perception had shifted a lot by the time Prop 8 rolled around in 2008. I think the tipping point in California could have been reached as early as 2009 if the vote had been taken again. Prop 8 changed the landscape dramatically.
In 2012, four states had gay marriage ballot issues. All four resulted in favor of the gays. Voters in Maine, Maryland, and Washington voted to allow gay marriage. Voters in Minnesota declined to modify the state constitution to prohibit gay marriage.
This totally changed the narrative and the idea that voters didn't or wouldn't approve of gay marriage disappeared as soon as the ballots were counted.
You are five years out of date. (On this one point. On much of your other claims you're even more out of date. You're five years out of date on the Regnerus study, also. Many of your other claims of harm and damage were discredited and disproved longer ago than that.)