Missouri isn't a very elastic state, this type of swing would be unreal and indicate a solid Romney win on election night.
It is bizarre, even crazier when you factor in that MO has picked the winner in every election but two since 1904. And both times it picked the wrong winner the margin was razor thin.
Of the last four polls, only PPP was in single digits. I think there is some sort of a weighting problem. It's either with PPP or the other ones.
What JJ neglects to mention is that the other two polls were from Wenzel Strategies (R) and (R)asmussen.