No idea, really.
I think it would have to be a state with a young population because one of the premises of the financial math of secession is that they would deport all the older folks on Medicare and SocSec. I can’t say that would work very well as a way to get elected to office in most states.
Utah, Idaho, and Texas are the “youngest” states.
Local politics, economics, and attitudes enter into it as well. Hawaii for example.