You make a big big mistake.
There are lots and lots and lots of American people with Hispanic origins. To lump them with illegals s to totally misunderstand the situation.
Ted Cruz, Marco Rubio..... the Bush kid running in Texas
I did not INTENTIALLY lump all Hispanics into the same barrel, I know many and some are related to me via marriage. (I have two grandchildren who happen to be part Hispanic). While I do agree there are "undesirables" in EVERY race, by in large the Hispanics that come here, albeit “illegally”, are NOT of that "bad" vintage, they just want a better life and since our borders no longer exist, they come for that opportunity. Hope that clears it up.
The fact that hispanic (or to be more precise, Mexican) majority towns are some of the poorest, most illiterate zip codes in America, and have levels of socioeconomic and cultural dysfunction similar to what we see in the black community (gang activity, teen mothers, etc) deflates this whole myth of them being "natural conservatives" and "Republicans who don't know it yet."
I can see Cuban-Americans as a natural Republican constituency, but not most Mexicans.