No, some of them are based on non-probability samples of people on the Internet. We really haven't figured out how to do social science research in the modern age. There was a brief period, about 50 years, when human behavior was compatible with our understanding of statistics.
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So... twisted people and Internet bots
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So are most of the campaigns we donate to, when they phone bank, text-a-thon, or door knock. :\
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I totally would pick up polls if I didn't primary get outright spam calls, but I've just given up altogether.
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You'd think they'd teach selection bias in schools by now...
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