What a great table! I love seeing it laid out like that.
It’s a widespread idea that you get a truer result by averaging the different polls.
But of course that’s not valid if all the pollsters are using basically the same flawed methodology.
However even with the possibly of flawed methodology, the oldest or first poll results are benchmarks for their respective polls to see if the candidates have moved up or down, which gives us some idea how the candidates are doing.
Like this one here where Trump increased his poll number by + 8%.
"Reuters: Trump Widens Lead in Poll to 32% After ‘Hard Line Immigration Stance’ "
http://www.breitbart.com/big-government/2015/08/22/reuters-trump-widens-lead-in-poll-to-32-after-hard-line-immigration-stance/