Since the House won't pass the bill, I don't think it will last that long for the really safe people. The ones on the fence maybe, but their liberal opponents would be even worse on the issue, and many others...
Everyone will calm down a bit, as long as the House doesn't cave. An enforcement only bill is what we need to get out of the Joint Cmte.
I'm not certain that the House won't pass it. I wish I remembered the link, but I remember reading about a month ago that Sensenbrenner will be outnumbered 3 or 4 to one during the reconciliation phase. And House Republicans are probably being informed that any campaign fund-raising with White House personnel is contingent on voting in support of the bill.