This is a volatile election year, to say the least. The two major-party candidates are far less than perfect, routinely commit gaffes (or perceived gaffes), and have been hurt by a variety of negative disclosures and actions. Two other challengers have gained a degree of attention and apparent support not seen since Ross Perot's presidential runs in the 1990s. Meanwhile, mistrust of the establishment press is at or near an all-time high, and several journalists have publicly decided that the idea of even trying (or pretending) to report in a fair and balanced manner is not appropriate this year.
In this environment, the nation's pollsters, who have seen huge prediction failures during the past several years — virtually all understating support for conservative candidates and causes — still expect the public to believe that the tiny percentage of people they contact who actually complete their surveys and interviews reflect the opinions of everyone else.