Regardless of what Rush says, this phony enforcement amendment was hatched in the backroom by both parties. It allows the Dems to say that they have given a huge concession and the Reps to trumpet it as a victory. It is the fig leaf that allows more Reps to vote for the bill. The amendment will be passed and then both sides will pass the "fixed" bill out of the Senate. This will allow enormous pressure to be placed on the House by the WH. It is all part of the strategy to get back the House in 2014.
The Reps in the Senate are responding to the Koch brothers, Murdoch, the Chamber of Commerce, corporatet interests, etc. who want more guest workers. This bill doubles the number of guest workers. It is a disaster for the American worker who will see higher unemployment and lower wages. Even the CBO agrees that will be the effect thru 2023 at least.