As its title suggests, Hillary Clinton’s soon-to-be-released book 'What Happened' delves into many factors that led to her surprising defeat in the 2016 election.

As its title suggests, Hillary Clinton’s soon-to-be-released book 'What Happened' delves into many factors that led to her surprising defeat in the 2016 election. 
Based on passages published by CNN, Clinton also devotes some space to challenging analyses offered by others, former Vice President Joe Biden being among them.
"Joe Biden said the Democratic Party in 2016 'did not talk about what it always stood for — and that was how to maintain a burgeoning middle class,'" she writes. "I find this fairly remarkable, considering that Joe himself campaigned for me all over the Midwest and talked plenty about the middle class." 
Biden made the comments in March during a discussion with Amy Gutmann, the president of the University of Pennsylvania. 
“You didn’t hear a single solitary sentence in the last campaign about that guy working on the assembly line making 60,000 bucks a year and a wife making $32,000 as a hostess in a restaurant," he said. "They are making 90 grand and they’ve got two kids and they can’t make it and they’re scared. They’re frightened, because they’re not stupid.” 
Besides Biden, Clinton takes aim at Bernie Sanders in her book.
She writes, in part, that Sanders’ frequent mentions of her well-compensated corporate speeches, “caused lasting damage, making it harder to unify progressives in the general election and paving the way for Trump's 'Crooked Hillary' campaign."