Yes, Sanders and Bloomberg cannot be on the same ticket....they are contradictions of each other.
Sanders is the leader now with Buttigieg right on his heels.
Klobuchar may be just a blip (we will see how she does in SC & NV)
I think Klobuchar is probably the VP choice, only to contest the Upper Midwest. They can’t win without some of those states, and Trump almost “accidentally” won Minnesota.