Its multipartisan membership consists of political consultants, pollsters, media consultants, campaign managers, corporate public affairs officers, professors, lobbyists, fundraisers, congressional staffers, and vendors.
en.wikipedia.org Hence, a moving average is used to link all polls from all pollsters into one series.
en.wikipedia.org This can be attributed to varying polling methods, demographics, and sample sizes between pollsters, amongst other things.
en.wikipedia.org The senior strategists are typically outside political consultants, primarily pollsters and media consultants.
en.wikipedia.org