Here's why it would be tough for Democrats to replace the president on the presidential ticket
Briefly

Delegates Biden won in the primaries are bound to support him unless he leaves the race. Democratic rules mandate this commitment, with no current indication from Biden of stepping aside.
VP Kamala Harris cannot automatically replace Biden as the presidential candidate. Democratic rules dictate nominating procedures and scenarios, with no provision for automatic replacement by the VP.
The current rules prevent automatic replacement at the Democratic National Convention. Biden's intentions and actions will determine the future of his reelection campaign, with no clear provision for a seamless transition of candidacy.
The Democratic National Convention, its rules, and nomination processes are influenced by the political parties. Contingencies for Biden's replacement would require significant procedural changes and rely on his voluntary exit.
Read at ABC7 San Francisco
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