You yourself alluded to his drop from previous polls........
It's called a trend.
It is funny to watch you twist yourself into little knots of illogic to try to force a point.
I mentioned his drop from the previous poll from that same polling company, not from previous polls. A single poll cannot be a trend. It may signal a true shift in support, or it may be an anomaly. Now, if the other polls start showing a large drop from their previous numbers for Perry, then you can start talking about a "trend".