Thank you for finding this and bringing it to the attention of the masses. I was just thinking about an article very similar to this publication of the concept, and was hoping to find the original source to it, because of the importance of the concepts within it.

One of the things that often irritates me when dealing with topics of politics, is the absurdity of trusting graphs and data points that don't extrapolate on where their data for those graphs came from. And when there is some sort of explanation available, it often just leads to the understanding that they did not use a random enough sample to avoid selection biases. Often times, I don't get to see much more of a source on the accuracy of the data other than some variance declaration dictating that there could be a 1-2 degree of variability in the data's accuracy. Something like that.

It's nice that they include that, but I want to know more. Especially in politics, because liars abound are everywhere.