In the summer of 2016, I lost my nerve. I let pollsters talk me into the impossibility of a Trump win. Like a lot of journalists, I started ignoring what I was seeing at rallies. It was a huge, inexcusable mistake. Once Trump was president, I realized that I’d fallen for the con in my own business, which preached that all races are exciting and close—unless one of the candidates is somehow politically unacceptable.

