Joe Biden: 'Equality is not a matter of "identity politics."'

The former VP shares an important message in the foreword of author Sarah McBride's new book.

Sarah McBride is a brilliant, accomplished woman with a brand-new book — and one very famous fan.

Actually, she has many famous fans, but just one wrote the foreword to her memoir, "Tomorrow Will Be Different." McBride is one of the most well-known activists in the fight for transgender rights. When she spoke at the 2016 Democratic National Convention, she became the first out trans person to address a major party's political convention, and she currently works as the Human Rights Campaign's national press secretary. Before that, she worked for a man named Beau Biden.

Beau was the son of former Vice President Joe Biden and served as Delaware's attorney general from 2007 to 2015. McBride worked in Beau's office, earning the admiration of both generations of Bidens.

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