Hillary’s high poll numbers in Texas are mostly due to heavily Democratic leaning hispanics, who are something like 40% of the population. Regardless of whether they describe themselves as “likely voters” or not to pollsters, voter turnout among hispanics is consistently much lower than that of non-hispanic groups. If they DID turn out to vote in the same numbers as Anglos, then Texas (and Arizona) would indeed be swing states.
Living here in Texas, I can attest to countless Republican Hispanics and conservative Hispanics. The poll is bull.