Online surveys are even worse than in-person, because they are hosted on particular sites, having particular audience, leaning or biased in particular way. E.g

Online surveys are even worse than in-person, because they are hosted on particular sites, having particular audience, leaning or biased in particular way. E.g. Poll on cnn.com and fox.com will give you opposite results. Also different age/wealth/profession groups have particular leanings on political spectrum and particular average level of computer proficiency. E.g. a farmer in Idaho would likely to vote for any Republican candidate and simultaneously less likely to participate in any online polling.