I feel like in most cases “the incumbent croaked” would suffice as an excuse
Primaries aren’t run by excuses, they are run by rules. There are state laws regarding who can get on a ballot, Biden/Harris qualified, and Whitmer did not. Which means that when the primaries roll around, Biden/Harris will be on the state ballots, and Whitmer won’t. Which means that throughout the primary season, Biden/Harris will be racking up delegates who are loyal to Biden/Harris.
If anything happens to Biden at this point, his delegates will vote for Harris at the nominating convention. Why? Because they were chosen specifically for that purpose. You only get to be a primary delegate for Biden/Harris 2024 if you are a strong supporter of both Biden and Harris. Specifically if you support them a lot more than Whitmer, Newsom, etc. If you have doubts about either Biden or Harris, then the Biden/Harris campaign will find someone else to be a delegate. All this means Whitmer has no chance at becoming the nominee as long as Harris is still around.
As for the rest: yes, Harris might be a great president. But most people who want a different Democratic candidate do not realize that she is the only alternative for 2024.
Primaries aren’t run by excuses, they are run by rules. There are state laws regarding who can get on a ballot, Biden/Harris qualified, and Whitmer did not. Which means that when the primaries roll around, Biden/Harris will be on the state ballots, and Whitmer won’t. Which means that throughout the primary season, Biden/Harris will be racking up delegates who are loyal to Biden/Harris.
If anything happens to Biden at this point, his delegates will vote for Harris at the nominating convention. Why? Because they were chosen specifically for that purpose. You only get to be a primary delegate for Biden/Harris 2024 if you are a strong supporter of both Biden and Harris. Specifically if you support them a lot more than Whitmer, Newsom, etc. If you have doubts about either Biden or Harris, then the Biden/Harris campaign will find someone else to be a delegate. All this means Whitmer has no chance at becoming the nominee as long as Harris is still around.
As for the rest: yes, Harris might be a great president. But most people who want a different Democratic candidate do not realize that she is the only alternative for 2024.