The polling firm that consistently predicted Bill Smith would be elected mayor of Calgary and challenged third-party observers who raised questions about its results now admits to "big, big polling failures." For weeks prior to Monday's vote, Mainstreet released poll after poll suggesting Smith was leading Nenshi by between nine and 17 points. After Nenshi won the election, Mainstreet admitted this poll was based on a 'wonky sample.' Meanwhile, in an interview with 660 News the day before the election, Mainstreet executive vice-president David Valentin suggested political commentators in Calgary were biased. Post-election humilityAs the election results rolled in and Nenshi's victory became clear, Maggi said he was incredulous, at first.

Source: CBC News October 18, 2017 19:27 UTC