The Democratic National Committee is killing its autopsy of the 2024 election. Ken Martin, the chairman of the D.N.C., said on Thursday that he had decided not to publish a report that he ordered months ago into what went wrong for the Democratic Party last year. Party officials have conducted more than 300 interviews with Democrats in all 50 states to create a document that Mr. Martin had once pitched as crucial to charting a path forward. Mr. Martin will instead keep the findings under seal. He believes that looking back so publicly and painfully at the past would prove...