The only thing I can think of is to further enhance their state laws in hopes the feds will take notice and take action, or unless they are gearing up towards succession.
It could just be a feel-good as someone mentioned before. It could be part of a bigger plan as well though.
I could only hope they are working toward having state laws that allow them enforcement to get rid of illegals, keep them off their health care and their state funded programs. I am sure there is a fine line the feds will play with them as far as federal money going to the state if they choose to enforce or how hard they enforce laws on the books.