Real Clear Politics has what it calls the "RCP" average for predict election results. It takes the last 5 polls and averages them together to get a consensus or predicted outcome.
This system is used frequently on Cable News and is often called the "poll of polls."
Below is a look at the RCP "polls of polls" margin of victory prediction and the actual results.
The results are from Primary states. Caucus states are not included so that we can have (as much as possible) an "apples to apples" comparison to the polling data for Pennsylvania.
There are no available "RCP Poll of Poll averages" for Primaries held in several states including Delaware, Mississippi, Vermont and Oklahoma. This was probably due to the lack of available polling completed for those states.
This left Real Clear Politics "polls of polls" available for 19 primary contests.
I separated the RCP results into the following categories.
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