Latinos, especially first generation immigrants, trend strongly toward being staunchly religious and socially conservative. As such, they tend to think Republicans, who are also religious conservatives, will be on their side. There's also a subset of legal immigrants who hate illegal immigrants. Add in that first generation immigrants often aren't fluent in English yet and that creates a layer of information exchange that conservative news outlets can exploit; if you don't translate the overtly racist crap the politicians say, you can make your audience rely on your white-washed commentary.

As for the folks who's families have been in the US for generations and who grew up fully bilingual in English and Spanish, I'm honestly not sure.