WHAT???? Explain that to me again?

I'm still trying to put this in some perspective that makes some sense! Numerous US cities and states have basically told the Feds "screw you" and given Illegal Mexican Aliens sanctuary, to which the Feds did NOTHING! But we in Arizona pass SB1070 to try to enforce existing Federal Law, and we get sued by that same Federal Government! Anybody? (made me laugh just reading it)