This is a national poll? So either this poll is junk, or PPP has a huge Republican bias?
It looks like this is a national poll, yes.
But among their poll questions (which is of registered voters), it says that the respondents voted for Obama over Romney by 51-42.This correctly states the percentage that voted for Obama but undercounts the percentage that voted for Mitt Romney. Apparently more people are forgetting that they voted for Mitt Romney. This pattern holds for other pollsters.
PPP may be run by a Democrat, but it seems to have a slight R lean in results. But it has shown Hillary Clinton winning such states as Kentucky and Texas, which is consistent with about a 2:1 national divide. Is 2:1 unrealistic? Of course. The biggest blowout of one of the two main-party candidates has been roughly 61-37. Could any Republican nominee for an open Presidency be voted down as badly as Alf Landon? I think not.
Christie looked good for standing up to the GOP on an immediate concern of his state. Mario Rubio has won much hype for having a Spanish surname. For obvious reasons Jeb Bush suggests a return to the bad old days of George W. Bush.
Bill Clinton will not have been President for 16 years.
