Pew is about all we have on the subject, though they are suspect as a left-leaning organization. Who are the ‘latinos’ that they polled? How do we know that they have legal status in the U.S., other than their say so? Illegals vote illegally using drivers licenses and affidavits. What is the likelihood that they are telling the truth to Pew, which itself has a bias toward obfuscating the truth? To grobsdriver’s point, did Pew segment these ‘latinos’ by length of legal status in the U.S. or birth in the U.S.? It is easy to get the result you want when you poll samples of the entire ‘latino’ population that includes twenty million illegal aliens.
There is actually Hispanic polling that goes all the way back to Kennedy-Nixon in 1960.
No Republican presidential candidate has EVER received more than 40% of the Hispanic vote.
Also, recent immigrants from non-Hispanic countries are moving further and further to the Left.
Bob Dole got a majority of the Asian vote in 1996.
In 2012, after massive immigration, 73% of Asians voted for Obama.