Tapper and Thompson's book, "Original Sin," paints a damning portrait of Biden's team covering up his diminished state before the election.

Joe Biden’s apparent physical and mental decline, his fateful decision to run for reelection, and the Democratic Party’s unwillingness to question that decision until it was too late are all back in the news in a big way,

NPR's Michel Martin speaks with Democratic strategist David Axelrod about Jake Tapper and Alex Thompson's book, which explores Biden's decline and how his inner circle has concealed it from the public.