Trump, Clinton Tied in Polls: Were All the Wise Men Wrong? By Michael Barone
It was conventional wisdom among the political cognoscenti during most of the primary season that Donald Trump could not win the general election. The evidence seemed strong.
Over 12 months of polling from May 2015 to April 2016, Hillary Clinton ran ahead of Trump in 63 national polls, while Trump led her in only six and tied her in three. Polls in the dozen or so 2012 target states showed similar results.