That must be the problem. The polling technique is entirely different within the boundaries of Manhattan and the DC metropolitan area. And everyone knows that to have a valid poll the interviewers must be physically present in the state that they are polling about.
/sarc
Moreover, my criticisms of the polls are well-supported by Jay Cost and many others have have noticed the same thing this cycle. In fact, in his latest column, he INDEED suggests that there may be some "institutional bias" deriving from their mind-set.
I don't care WHY they are off, only that they are.