The Washington Post-SurveyMonkey 50-state poll was conducted to provide an expansive portrait of American voter attitudes about the 2016 election from every part of the country. How the survey was conductedThe Post-SurveyMonkey poll used an online-based sampling methodology that differs from previous polls by The Washington Post. [Full question wording and methodology of Post-SurveyMonkey poll]The Post-SurveyMonkey poll employed a “non-probability” sample of respondents. With non-probability samples, testing is necessary to ensure a particular sampling strategy, along with adjustments to match population demographics, can consistently produce accurate estimates. Several benchmarking studies have found that probability sample surveys produce smaller errors than samples from opt-in, non-probability surveys.

Source: Washington Post September 06, 2016 11:07 UTC