“Mook knew that Hillary viewed almost every early decision through a 2008 lens: she thought almost everything her own campaign had done was flawed and everything Obama’s had done was pristine.”

Since Obama had spent efficiently and Hillary in 2008 had not, this led to spending cutbacks in the 2016 race in crucial areas, including the hiring of outreach staff in states like Michigan. This led to a string of similarly insane self-defeating decisions. As the book puts it, the “obsession with efficiency had come at the cost of broad voter contact in states that would become important battlegrounds.”