Ezra Klein interviews Jake Tapper, co-author of "Original Sin: President Biden's Decline, Its Cover-Up, and His Disastrous Choice to Run Again," discussing the book's findings on the alleged cover-up of President Biden's cognitive decline. They explore the Robert Hur report, the White House's reaction to it, and the accommodations made for Biden, such as teleprompters at small fundraisers and limiting his schedule. They delve into the decision to have a June debate, Tapper's experience moderating it, and the Democratic Party's response. The conversation also covers the role of key figures like Jill Biden, Mike Donilon, and others in enabling Biden's run, the lack of internal polling, and the party's insular conversation with itself. Finally, they discuss the lessons learned from the situation, including the media's reliance on inside information and the structural issues within political parties that make it difficult to acknowledge obvious truths.