As I asked the question a lot of ideas came to mind. The government certainly took a liberal swing after the 19th amendment. A lot of the political progress made over the years was secret. The media has had a lot to do with outing gays. All of these things have added together to the point of giving us gay marriages and gay adoptions and gay politicians and gay teachers. These are some key offices to hold to further a cause.
How should Christians feel about this?
Not as a Christian, but as an American, I categorically reject the notion that it is good for gay marriages and gay adoptions and gay politicians and gay teachers to be openly acknowledged to children and all. I reject the notion that unions between gays are to be held up publicly as equally valuable as marriage.
I do not categorize what homosexuals do privately as sinful, nor do I recommend total abstinence on their part. Nor do I know how Christians should feel.
What I take from your comment about the 19th amendment, is that things here were changing slowly and we became a liberal society, in a good sense. In the same sense that Afghanistan has liberalized. Women won voting privileges.
But now the notion of "equality" has become fetishized. In the area of race, I do believe in equality under the law. I do believe in the endeavor for public policy to become completely race-blind.
But it is not so clear-cut for gender, and certainly not for sexual orientation. The liberal movement is unwilling to make distinctions proper to these areas.