First, this is a lot of work, so thanks for your efforts.
Second, in your opinion as someone who understands these things - do you think that most polling companies oversample Dems for the reason that people on FR would say - i.e. they want to skew the outcome to favor the Democrat as a way of influencing public opinion?
Or is there a statistically-valid reason for doing so?
In other words, does your chart help educate us on the inner workings of fair and honest polls, or does it expose manipulation?
I am in line with those here at FR who believe the Dem oversample is a way to create public opinion. I also think it is starting to backlash. Marist is th worst of the bunch, but PPP isn’t far behind.