If Obama is arguing that states/locals cannot create their own laws on immigration enforcement even if they mirror fed or enhance fed laws, then how do they explain sanctuary cities who make their own laws up that are against fed enforcement of the laws??? Legal precedence says states can supplement and help fed laws, and cannot be contrary to fed law. Thus AZ is in line with precedence, and sanctuary cities are not. But Obama choses to go after AZ and not sanctuary cities. By the way, MO has the same immigration law as AZ, but they are not excoriated by the MSM because the MO gov is a Dem.