It backfired on them the last time, during good economic times. Remember the big demos for amnesty a couple of summers ago? It will backfire worse if they try it again now.
They didn't learn last time?
The “Day without a Mexican” was a complete bust here in California.
The demonstrations a couple years ago drove the nail in the coffin so hard, that even 0bama with a Donkey House and Senate didn't fall on THAT sword.