To a defiant President Joe Biden, the 2024 election is up to the public — not the Democrats on Capitol Hill. But the chorus of Democratic voices calling for him to step aside is growing, from donors, strategists, lawmakers and their constituents who say he should bow out. The party has not fallen in line behind him even after the events that were set up as part of a blitz to reset his imperiled campaign and show everyone he wasn’t too old to stay in the job or to do it another four years. On Saturday, a fifth Democratic lawmaker...