President Bush is making exactly the same mistake with immigraiton as Governor Owens made when he supported Referendum C. By undercutting his own party on a major issue to partner with the opposition - which clearly sees this deal as a first, not a last, step, President Bush risks demoralizing his party, and robbing it of a signature, defining issue, just as Governor Owens did out here.
And it's no good running against the bill once it passes. People very shortly accept the new reality, won't see any new, immediate, or dramatic changes in their lives, and won't be tempted to vote on this issue next year, after it's been fact for a year or so.
However, if the bill can be defeated, killed, then it can still be a live campaign issue next year, one that poses the promise of recapturing many of the Reagan Democrats. In fact, the immigration bill probably has a better chance than Ref C did of helping Republicans, since it's much less popular and won't be put to a referendum. Should it pass, all this will be moot, but should it fail, it will provide a terrific issue for the Republican candidate to run on.
We've seen this movie before. We can give it a different ending.