PP has egg on their face.
Not really.
Their combined poll for Sunday/Monday was Santorum+1, Romney wins by 3.
First of all, this is within the MoE.
Second, the CNN Exit Poll says that about 10% of voters decided on who to vote for just on Tuesday and these voters went strongly for Romney. So, PPP couldn't pick up these election day voters. And the Exit Poll also said that "in the days before Tuesday", voters who decided in these days picked Santorum - that's exactly when PPP was in the field.
Third, their AZ poll was pretty good.