I'm going to guess that last week was too favorable to Clinton and this week is too favorable to Trump.
Yeah, a 6 point drop off doesn't make much sense. Looks like statistical noise.
I never believed she was up that much in PA in the first place. Although Trump is weaker than other Republicans in traditional conservative states like TX, GA ect, he is much strong in the rust belt area. I have a strong feeling that PA is within 5 points right now.
Hillary is cleaning his clock in big dem states like CA and NY, while Trump is only modestly ahead in big GOP states like TX, GA, which would explain why Trump might be down a few points nationally but still doing very well in Ohio, Iowa, Maine, MI, WI, ect. Also CO, despite not being in the rust belt, is very similar in many ways.
Watch the rust belt!