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Methodology It’s not an online poll, it’s a traditional poll done weekly with 1000 respondents.

While it's not an online poll like the ones on e-mail lists or websites, it is NOT a traditional poll. I suspect they are accurate enough in the UK, where they have large registration, but I believe they have yet to prove themselves stateside.

From Wikipedia:
YouGov specialises in market research through online methods. The company’s methodology involves obtaining responses from an invited group of internet users, and then weighing these responses in line with demographic information. It draws these demographically-representative samples from a panel of 3 million people worldwide including over 600,000 people in the UK.[6] As YouGov's online methods use no field-force, its costs are lower than some face-to-face or telephone methods.