The polling is ongoing day in and day out. Truth is people don’t change their candidate daily like polls would have you think.
So these polls are not trustworthy except maybe monthly or after some event or revelation that really changes how people look at a candidate.
Those things do not happen daily.
From my own experience, you are 100% correct, IMHO. I’ve been for Ted Cruz right from the beginning. I won’t change unless he is no longer a candidate. What the liars in the “media” say means absolutely nothing to me.