Well the ball is in Biden's court. He won the primary fair-and-square, so for the most part, only he can choose to voluntarily relinquish those delegates. This is why you're seeing so many articles about this - it's a pressure campaign to convince Biden himself to consider stepping down.
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Under DNC rules, requests to nominate a candidate must be presented in writing and include written approval from the proposed nominee – as well as a petition with signatures from at least 300 convention delegates.
Another complicating factor: a plan announced by the Democratic National Committee long before Biden’s disastrous debate to do a virtual roll call vote sometime before the convention.
At the convention, each candidate would be allowed 20 minutes of supporting speeches from the people nominating and seconding them – and then there would be a roll call vote by states, in alphabetical order.
An open convention would be “reality TV like you can't imagine,” said Elaine Kamarck, a senior fellow at the Brookings Institution and a DNC member.
Then, while the primary was still underway, Robert F. Kennedy was assassinated, leaving Vice President Hubert Humphrey to battle it out with anti-war Senator Eugene McCarthy.
Republican Richard Nixon won the election that November and Democrats instituted a series of reforms to the nominating process to give regular voters more say.