Not Picking Warren Would Be A Mistake
Not picking Warren would be a mistake, like Al Gore keeping Bill Clinton away in 2000.
Warren earned it. Imagine the Republican nomination in Cleveland going to Mitt Romney or Jeb Bush. Donald Trump is bad but he won the votes in the primary.
Warren has earned the VP spot as much as Hillary has earned the top spot. Somebody from that crowd is most likely to succeed Hillary in eight years.
I have nothing against Tim Kaine any more than I have anything against Mitt Romney or Jeb Bush. Let the democratic process decide.
Not picking Warren is going to pour water on the enthusiasm.