Regarding the feds suing Arizona.
I wish that Arizona would not play this game. By entering the battle this way they validate the false premise that the Feds have any say in this.
Businesses and good politicians would just say: "We do not recognize your authority on this issue". Then move on and do whatever they have planed. Brewer in Arizona should mobilize the Guard, Marshals and Sheriffs and remove all federal employees from the state. Maybe the border patrol could stay if they DO THEIR JOB if not they are out too!
The federal government would not exist if not for a voluntary agreement by the states. It is time they put all of the pieces back where they belong or dissolve the union.