big issue in appalachia / red states were republican lawmakers have tried to thwart laws restricting the practice
And, even more bizarrely, when there was a recent push to abolish it, it was resisted by, among others, the ACLU and Planned Parenthood branches on California (despite the same organizations national and relevant state organizations not opposing moves to ban child marriage in other states.)
Man, that's gotta lead to some occasional legal spaghetti code crap getting dragged through probate court, bankruptcy court, and all the other subjects that is marriage relevant.