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I just read an article about the problem with polling. Specifically, that the type of people who are likely to respond to these requests no longer represent the cross section of the population. I'm going to try and paraphrase here. 30 years ago, people who responded to polls were no different in how they voted than people who ignored them. Now, there's reason to believe that the people who willingly take the time to respond do not vote the same way as people who ignore them.
Something about trust and strangers and willingness to participate in these types of social data gathering ventures. This does lead to polls leaning left since more people on the right are going to distrust the polling process itself and thus refuse to participate. Even the right leaning participants will be different from the right leaning abstainers in how they view social participation and that also skews the results.
Yes, that's called non response bias and it's getting worse. Bias means your sample won't be representative of the population.