"The RNC types here on FR swear that these are future GOP votes - but we know better!"
You mean poor, uneducated, heavily into welfare, socialists aren't the core of the future GOP?
Karl Rove is probably telling Bush that the arithmetic is the answer, that the Mexicans are going to get into the country and vote no matter what anyone wants, because the Dems are going to help them, and Bush's successors will end up like Pete Wilson in California if they try to stop the Mexican train instead of getting on board.
Of course, that begs the question of what happens when China gets here.
And it also begs the question of constitutional responsibility to the electorate, who are being crushed by a) immigration-imposed social costs and b) hurt by falling wages caused by cheap immigrant labor.
Of course, the real reason is that the RNC's big contributors among the Park Avenue and Grosse Pointe crowds and down at the U.S. Chamber of Commerce are demanding that the cheap labor be kept coming. That's all they've really cared about since (even before) the Irish potato famine, that and hard money/low inflation. And keeping the riff-raff out of the "good buildings" on Park Avenue. At least they've given up on trying to keep Jews out of the better resorts upstate.
Of course, those people think they'll continue to do well when China gets here, and Chinese start to freeze non-Chinese out of their business and financial arrangements the way they do in Malaysia and Indonesia......when they aren't bribing kwai loh presidents on behalf of PLA intelligence, that is, or "partnering" to get their hands on kwai loh technology and market access, like Lenovo's deal with IBM to buy their PC business (IBM "only" had 6% of the market, so selling out to the Chinese was the wise play, you see).
In pushing this demographic, cheap-labor play, American businesses are making the same mistake Carthaginian ones did when they stiffed Hannibal for operating funds for Italy. Short-term thinking, no vision, no sense of shared enterprise -- or, as things turned out for the Carthaginians, shared fate.