I think there's a divergence between the PPP polls for the political PAC and their regular polling. You would think they'd want to control the Party ID for the PAC polls if the PAC poll's purpose is to advocate that their guy has the lead.
With that said, it's hard to tell PPP's methodology. There is no methodology statement anywhere on any of their polls and the cross-tabs show percentages as opposed to raw data.
I see no reason why they would compromise their integrity by weighting their result to please their sponsor. Thought I can't say for sure, but I'm fairly sure most independent polling outfits don't skew their results for their sponsors. I also cannot say that I know their methodology either, but they were extraordinarily accurate in 2008. It doesn't really matter if they show percentages or raw data if they are not weighting. You can easily figure it out.
Well, I'll respectfully disagree with you on the end result. I think this poll represents Obama's floor, with him somewhat outperforming, although perhaps not to double-digits. It'll still be within the margin of error.