That Cruz is even tied (if he is) in his own state in a new Texas poll is no big deal.
They use different parameters. RCP uses polls from selected organizations who use telephone interviews whereas HuffPost simply includes all polls from all sources in its aggregate averaging.
Some pundits, especially, for what it is worth Nate Silver see online polls as totally valid whereas RCP appears to think otherwise. However, if aggregate smooths out all distortions then it is fait to say an aggregate which includes both RCP and Huffpost would be the most accurate availabel.
If that is the case the case then this is the current situation
Thus the "poll of aggregate pollsters gives these results today;