There are 38 states in support now.
Looking at it another way, they cannot all be blue or red states, there aren’t 38 blue states maybe only 22, so 16 or so would have to be red states. I wouldn’t think you could find quite that many in the same sex marriage camp.
Those states don't support it. They reject it. The Supremes overturned their vote.
That's why they don't go for an out and out Constitutional Amendment. They know they can't get enough states to ratify it.