The polls were wrong. The strategy was wrong. The data was wrong.
Shortly after midnight on Nov. 9, 2016, 18 months of carefully weighted, religiously updated forecasts evaporated into the ether as Donald J. Trump scored a series of upset victories to secure his status as the 45th president of the United States.
But the election post-mortem hasn’t just been a crisis of confidence for the number-crunching community.
It shook people up on the client side and the agency side, according to 30-year ad industry veteran and consultant Avi Dan.