Prepping for a fight, N.Y. Dems, leaders, line up for Kamala.

The article details President Joe Biden's announcement that he will not seek reelection and his endorsement of Vice President Kamala Harris as his successor. Topics include Biden's decision to withdraw from the 2024 presidential race, Harris's potential historic candidacy as the first Black, South Asian, and female president, and the surge in campaign support for Harris following Biden's endorsement, which has energized the upcoming Democratic National Convention and general election.