Former White House press secretary Karine Jean-Pierre defends President Joe Biden in her new book, rejecting claims of his mental decline made in Jake Tapper's 'Original Sin.' Jean-Pierre insists she saw no evidence of cognitive issues during her time in the administration, attributing Biden's poor debate performance to a cold. The book also details her decision to leave the Democratic Party, citing disappointment with party leadership and internal dynamics, including alleged mistreatment by a senior White House staffer. Jean-Pierre criticizes the party's handling of both Biden and Vice President Kamala Harris, expressing frustration with what she describes as infighting, poor messaging, and the marginalization of Black women in politics.