John,
The debate may have been depressing, but it also presented a crucial opportunity that Democrats must seize.
Offer 24 hours of mourning and Biden exiting the race (he will need pushing or dragging because he likely won't volunteer).
Then, immediately set up an open process for selecting a new Democratic nominee. Time is pressing, but with determination, this is doable. We must include an array of candidates and resist grabbing one person.
The results will be exciting and invigorating, winning the election and creating a more positive American future.
What's not to like?
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Best.