The best thing about this poll is it has Cruz leading among whites only 61-34. If that is not too far off, that is about what Beto would need to be in serious business.
I'm skeptical though. In particular...
Too bad there is no education crosstab. Since they didn't ask education, I guess they didn't weight by education? If so they may have oversampled educated voters who are more likely to respond to polls.
Aren't more highly educated voters also more likely to vote, though? So perhaps it balances out to some extent.