"Potential Successors: Hillary Clinton Emerges as Top Pick if Biden Doesn't Run in 2024"

If a sitting president dies while running for reelection, the vice president, in this case Kamala Harris, would assume the presidency. From an electoral standpoint, Harris would replace the deceased president as the Democratic presidential candidate, but his death would likely open the door for other Democrats to enter the 2024 race. State election officials may need to adjust filing deadlines to allow new candidates to enter the race. If the president died during primary season, some states may postpone their scheduled primaries. If the president died after securing their party's nomination but before Election Day, both the Democratic and Republican parties have guidelines in place for selecting an alternate nominee.