The potential scenarios of replacing presidential candidates due to death, incapacitation, or withdrawal are complex and guided by party rules, state and federal laws, and the US constitution.
If Democrats decide to replace President Joe Biden as nominee, how would it happen?
If Biden decides not to run, the Democratic party's convention process would determine a replacement, possibly with Kamala Harris gaining support as an alternative candidate.
Here's why it would be tough for Democrats to replace the president on the presidential ticket
Delegates won in primaries bound to support Biden unless he steps aside.