For much of the 2024 campaign, President Joe Biden could easily see himself taking the stage at the Democratic National Convention to accept the party's nomination -- a victory lap as he sought a second term in the White House. But now, Biden's prime-time speech in Chicago on Monday night will mark a bittersweet moment for his legacy and for the party. DNC LIVE UPDATES : Democrats set to rally around Kamala Harris as nominee It comes after a rapid shuffle catapulted Vice President Kamala Harris to the top of the ticket as Biden exited the race amid Democrats' concerns about his age and ability to campaign reached a boiling point.

"This is extraordinary in a lot of ways in politics because sitting presidents don't often turn over the reins," said Jim Kessler, co-founder of the center-left think tank Third Way. The scene will be a study in political contrasts, he says. "In a way, it feels like a Hall of Fame athlete that's making the tour to stadiums in the final season.

But it's also a torch passing and the Harris campaign is about the future," Kessler said. "The needle I expect Biden will thread is celebrating the past and focusing on the future." RELATED : How to watch, what to know about the 2024 DNC Biden is slated to speak on the opening night of what will be a four-day gathering of prominent Democrats from across the nation culminating in Harris and her running mate Gov.

Tim Walz celebrating her history-making rise to become the party's nominee. Asked by a reporter on Su.