Here is a link from a political scientist that tells you how a poll is constructed. Don't be fooled into thinking it is a liberal post simply because it is a on Daily Kos. It is a well stated summary of how it is done (I can speak w. a little authority here since my Ph.D. is in poli sci). If you want a more in depth explanation of the poll analysis, go here.
Here's a great one to pair that with -- 20 Questions a Journalist Should Ask About Poll Results. You don't need to be a journalist just a critical thinker!
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