Since the 2012 election, most (not all, but most) Republicans have agreed that if they're going to remain viable in presidential elections in coming years, the party will have to broaden its appeal, particularly to Latino voters. There has been plenty of disagreement about how to go about this task, and whether comprehensive immigration reform, which many Republicans object to, is too high a policy price to pay to achieve some uncertain measure of good will from those voters. But outside of conservative talk radio, there weren't many voices saying that they should junk the whole project. Every once in a while some voice from the past like Phyllis Schlafly would come out and bleat that the party should focus on the white folk who make up the party's beating heart, but to many it seemed like the political equivalent of your racist great aunt saying at Thanksgiving that she really doesn't feel comfortable around those people.
But as immigration reform wends its tortured path through Congress, more mainstream Republicans are having second thoughts. In fact, rather significant backlash is brewing, not just to this bill but to the whole idea of Republicans working to appeal to minorities. Benjy Sarlin at MSNBC has an excellent article explaining how this backlash is spreading, noting that even some people who six months ago were blaming Mitt Romney's position on immigration reform for his loss are now saying that the only viable path to victory is getting turnout up among white voters.
I'll get to why this is a very bad idea in a moment, but the logic at work isn't completely crazy.