Since when is John Kerry "new blood"?
Well that was my term, as in new as a candidate, rather than new on the political stage. Rupert used the word "replacement."
If Hillary tanks, I really don't see myself, how Sanders can just be kicked to the curb at this point. That would really, really enrage his supporters, and I don't see how someone new could put together a campaign at this point, and just roll over Sanders.
He definitely can't - Not without pissing off Millennials and backlash from some of the most active groups of people in the party. It would be incredibly shortsighted and dumb, for several reasons, to try and roll out some other guy who isn't even in the race at this point in time.