The problem, I think is obvious. If you add up the percentages, you get 193%. This is obviously wrong, since even Rachel Maddow knows that a circle has 360%. And a pie chart is a circle. Therefore, a duck is made out of wood, just like a witch.
Thus, we all want to know about the missing 167% has gone to. That is too big to be reporting error.
Perhaps the explanation is that the source is "Opinions Dynamic." Dynamic, indeed.
(Nod to RL, who is only partly made out of wood, and even then only after a glass of wine)