The downturn in the accuracy of polling seems to have picked up steam in 2012, after major pollsters Rasmussen (which is right-leaning) and Gallup (which is not) showed that Republican challenger Mitt Romney would best incumbent President Barack Obama.
Obviously, Romney did not win, and Gallup ended up holding a news conference about the errors in its polling and correcting its methodology. Gallup listed four reasons why its polls were so wrong, including the way it weighted white respondents and categorized likely voters.
Not every pollster was wrong about the 2012 election. The Real Clear Politics average ended up being accurate and Public Policy Polling, a liberal firm, was actually the most accurate pollster of the election....
(Excerpt) Read more at observer.com ...
