According to Nate Silver, PPP not even close to being the best pollster of 2012

[I spent the winter writing songs about getting better]

There are some obvious problems with Silver's methodology.  The last 21 days does not take into account any last minute swings.  It also doesn't take into account that some of the pollsters didn't poll due to Sandy.

Do you maintain your claim of a 3 point or more "house bias" in PPP polling?

Why don't you ask Nate Silver since he's the one who came up with that number.
http://fivethirtyeight.blogs.nytimes.com/2012/06/22/calculating-house-effects-of-polling-firms/

...in June. And with a model that compared to the other pollsters and the average, not the actual result for obvious reasons.

J. J. seems to be sticking to his guns that PPP has a Dem bias. It's just like the Bradley Effect in 2008 all over again.