President Biden is set to deliver a keynote address at the Democratic National Convention in Chicago, where he will formally endorse Vice President Kamala Harris as the party's nominee. Following his speech, Biden will leave for a vacation in California, marking his absence from the rest of the convention. Reports indicate that Biden feels 'bitterness' and 'betrayal' after being pushed out of the presidential race amidst concerns about his viability against Donald Trump. Nancy Pelosi reportedly pressured Biden to withdraw, threatening to publicly undermine him if he did not heed calls to step aside. Despite the emotional nature of his sendoff, Biden is expected to commend Harris as essential for defending democracy. The dynamics of the event reflect a significant shift in the party as Harris gains support ahead of the election.