What I would do is watch how the candidates behave today and tomorrow. They all have internal polls that are better than these. If Trump starts massively attacking Cruz this poll is probably accurate. Same with Cruz attacking Rubio (means Rubio is closer)
Just as an FYI this was close to the final spread in Iowa and we fondly remember how that turned out.
Also, interesting to note that in 2012, it was the PPP poll that was most closest to the big Gingrich win there in SC: Rasmussen being the most significantly off Take a look.
-— If Trump starts massively attacking Cruz this poll is probably accurate. -—
His inner Code Pink is being exposed by the pressure. Do Americans really want an unstable president?