It took a debate disaster and a pressure campaign led by Pelosi. But at the DNC, Biden finally kept his promise to be a bridge to the Democratic Party's future.

• President Biden on the first night of the DNC gave a speech that just weeks ago seemed improbable.
• In cementing his legacy, the retiring Biden gave Democrats a rousing speech at the convention.
• Biden's full-throated support for Harris is poised to set off the party's generational shift.

As President Joe Biden took to the stage at the Democratic National Convention on Monday, the schedule for the first night of festivities was not the way he originally envisioned it just weeks ago.