immigration amendments?

In lieu of the march(es) in Washington D.C. and lobby days this week by immigration reform groups, the Senate is looking to take up immigration reform (again). This time, there is a vow to pass something before the Fourth of July recess.

There is an Obama/Grassley/Bacucus amendment that circumnavigates some of the more stringent provisions of Title III. The Senate bill has an entire title dedicated to employment verification systems. It would require employers to run employees' social security numbers through the Employment Verification System to make sure they are who they claim to be. If there a no match, they have to run it through a different system. The current bill also requires employees to submit a REAL ID Act compliant, biometric identification card but the aforementioned amendment goes past that.

Proponents are willing to call it a deal breaker... is it though?