You have simultaneously also described why you can’t easily unite a left-leaning base. My issue is obviously the most important (and so is everyone else’s to them) at every moment. Also if you are a rep you are honor bound to resign and recuse and be a perfect parent of the children in the other camp.
Yes, we can walk and chew gum, but you can’t chase every car in the lot at the same time and you can’t shoot yourself in the leg out of honor when the competition is going to shoot your other leg for spite.