I don't know where that chart came from but this one is from the same source july 3
The full poll report
https://www.langerresearch.com/wp-co...0Democrats.pdf
If and when Warren drops out, bernie will pick-up most of that vote. (more especially if she is his VP)
If Biden should take this, his best pick for VP is Harris.
If Warren should somehow pull it off, her best pick would be Beto
But I gotta say there is something about Pete that I like a lot.