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This is another attempt to force amnesty for illegal aliens through. They have to make it look like they are enforcing the law in order to use the old con they always use. They'll give some superficial enforcement of the law and then say "we have secured the border so we have to give amnesty to everyone already here..."

Another point. This is also an attempt by the administration to undermine Arizona's case for their immigration law. If AZ wins the suit it could rewrite the balance of power between the feds and the states. The feds don't want more checks on their power. If Obama starts enforcing the law, then AZ can't claim that they had no choice but to protect themselves since the feds wouldn't. Then once the case is over and the Administration has AZ's law quashed, they can stop their superficial enforcing the law again.

It's also an election year, and the Obama Administration has to woo the angry people back until after the election.