President Biden and Vice-President Harris are officially in the race for the Oval Office—again. For the past three years, strategists, members of the press, and voters have speculated that Biden might serve only one term in office, after he had described himself, during the 2020 campaign, as a “bridge” to future Democratic leaders. But Biden’s announcement this week of his bid for reëlection confirms that the bridge does not lead to Kamala Harris in 2024. With voters worried about Biden’s age—eighty—eyes are on his running mate, who is the first woman, the first Black person, and the first South Asian person to serve as Vice-President. The New Yorker staff writers Susan B. Glasser, Jane Mayer, and Evan Osnos look at why Biden chose to run again, whether Harris will be an asset or a drag on his campaign, and how the 2024 election will serve as a referendum on the character of America.