And now we get to the real danger that Trump represents to the GOP. And to do that, we have to look at some history: prior to 1964, African-Americans voted Democrat around 60-40. Since then, its been 80-20 or even higher. The change came when Barry Goldwater, the 1964 GOP candidate for President, came out against the Civil Right Act. It didn't matter that his opposition was based on a principled libertarianism rather than racism. It didn't matter that Republicans in Congress by and large supported the Civil Rights Act and were instrumental in its passage. What mattered was that Goldwater was the face of the Republican party, and blacks watched Republicans turn to him and reject the centrist Rockefeller, and they perceived that Republicans were not on their side. That perception has never changed.
I think Latinos are watching the debacle going on right now as closely as African-Americans watched politics in 1964. I think they are watching Trump's numbers rise and thinking "Wow, the GOP really doesn't like us; they're not on our side." It doesn't matter that many if not most of those conservatives who are anti-illegal immigrant are not anti-Latino; the majority of Latinos link the two together, according to poll after poll. (And of course they're spurred on by the Democratic party.) Even as Trump declines as he eventually will, the Republican candidate will become much tougher on this issue as a result- even if it's Jeb Bush. And I believe the increase in Latinos turning permanently to Democrats will be nearly as intense and significant as it was in 1964- perhaps more so, because if Republicans eventually lose Texas (the state with the largest growing Latino demographic) they will have NO path to the White House. None.