John Ford, the reason many opposed that bill was because it wasn't liberal enough.
Not exactly. It is true that there was substantial opposition to the bill from Democratic Senators because the guest worker provision would certainly have led to wroker exploitation. However, I would not chacterize their objection as only a liberal one. I see nothing in conservative philosophy that should prevent one from wanting to ensure that workers are not abused, and I'm sure that many Republican members were concerned about these very provisions.
I'd also suggest that, while the Senate bill could be attacked from both right and left, public opinion on immigration leans strongly to the right.
The most recent NBC poll (from June) shows how strongly to the right the public's mood is. 65% favor a border fence. 73% favor making immigrants learn English before becoming citizens. 57% favor employers sanctions for hiring an illegal immigrant. 55% oppose allowing illegals to apply for permanent residency. 64% oppose allowing illegals to be given temporary work visas. And on and on and on.