I read the case. Basically it's about a waste disposal issue with Congress trying to force the state in question to make certain legislation. There are references to 10th amendment rights of the states and protecting states sovereignty.
I get the distinct impression that "protecting states sovereignty" is more policy guided by the 10th amendment than law required by the 10th amendment, and, if something really important came up, like a national retail sales tax, the lip service to the 10th amendment would come to a screeching halt.
But then, I'm a cynic anyway.
Just thought you might find it interesting given that it is fairly recent. I'm pretty cynical too, but not so much as to ignore an opening that might be useful to widen. Perhaps it is a beginning.