As per your observation, that's what's key... the consistency.
Every single poll worth looking at, literally every single one since he's announced, shows him with a clear double digit lead between 10 and fourteen points.
Not only that, but his appeal is very broad-based and cuts across nearly all demographics - rich/poor, north/south, educated/blue collar, young/old, male/female etc. Hence, it can't be said his numbers are the result of a demographic anomaly, flawed data or some liberal media polling conspiracy.
The only thing that can be objectively gleaned is that Perry is an EXTREMELY strong candidate who has dominated the field since the moment he announced.