Liz shouldn't be picked. I think it's better for her to stay in the senate and push for her issues. Biden should pick someone largely in line with him and who is ready to succeed him in four or eight years. Liz adds little balance to the ticket other than being a woman. She has neither a strong base among blacks, nor among Hispanics. And I think her brand could hurt in critical suburbs. It should be one of CCM, Kamala, Whitmer or Klobuchar (in that order). Not even the bros are wild about her; if Uncle Joe wants a progressive, I'd even prefer Pressley over her (big minus: she's not very experienced). Baldwin would be great, but Democrats can't risk losing her seat.
CCM doesn't speak Spanish, Kamala didn't even perform well with blacks, for Klobachar and Whitner, I could see the case. The Bernie Bros want Sanders himself on the ticket.