100%. Or rather, 0% as the OP only addresses people who are completely straight or completely gay. The Kinsey scale is definitely far more correct than the idea of a binary coding. Everybody is somewhere between the two extremes.
Liberté. Égalité. Fraternité.
When the constitution was written in the late 1700's marriage wasn't a concern of the government. Marriages were granted by churches. State issued marriage licenses didn't become a function of government until the early 1900's. The authors of the constitution had no idea that such a thing would ever be considered.
My point was more in regards to the rights subsequent to such a legal recognition...visitation, inheritance, etc.
“The reasonable man adapts himself to the world: the unreasonable one persists to adapt the world to himself.
Therefore all progress depends on the unreasonable man.” ― George Bernard Shaw, Man and Superman
If you watch Hollywood productions it seems like at least 20% of America is gay. Of course that may be true in Hollyweird but not in real America,