Let's be real for a minute here. There was only one correct choice for Hillary's VP: when your primary opponent is getting record enthusiasm, raising huge sums of money through small donations, and drawing even bigger crowds than Trump, it should be clear that his message is resonating and that you need him on the ticket in order to fire up the activist base and get them out in force. It was dumb of her not to pick Bernie, and not shoring up her Left Flank was what cost her the election. Add to that it would have united the party and greatly limited the Wikileaks/DNC hack damage.
I largely agree with this.