https://edition.cnn.com/2024/08/15/politics/joe-biden-legacy...

This was not a move by Biden to position Kamala for a loss, but he certainly did not want Pelosi and the Democratic establishment to gloat on a win. Which is why he immediately endorsed Kamala for the presidency, right after announcing he was stepping down from the race.

> https://www.youtube.com/watch?v=O9fSK2AR594

Pelosi suggested there should have been an open primary after Biden dropped out. But Biden's endorsement ensured that they could not backtrack from Harris.