|Liz Warren, Cory Booker, Tim Kaine|
Kaine is the establishment pick. He is so establishment he has "Beltway Insider" tattooed on his chest in inch high gangsta font. In a time where establishment insiders are held in contempt and Hillary already fills the insider niche, Kaine would signal to both Bernie supporters and independent voters that their voices would not be heard.
At this point my best guess is Liz Warren and Sessions but I wouldn't wager a farthing on the subject.