Each week we should bet on the next Dem to drop culminating in the foreshadowing of the DNC Nom.
Betting begins, who is the next to drop out? Each cycle is 7 days, starting with today, oddly, Tuesday. Double points for predicting a 2-fer in the week cycle. We are now in week 1. Put your bet in brackets, e.g., [Week 1 - Bennet] Vitriolic reason: Who? Something like that.
Vitriolic reasons why your pick is doomed is very much appreciated and rewarded.

My first pick:
[Week 1 - Booker] Money. Raising nothing, needs to preserve at least a minimal standing as Junior Senator to remain a senator.