I think he knows he won't win the nom.

But if he runs as a 3rd party out of the gate he'll get labelled a spoiler, etc.


What if he's running in the primary to a)look like a good democrat and b) get on debate stages, in polls, etc to build at least some support within the party.

Then, if its Bernie or Liz, he'll run 3rd party. Maybe even get a never-trumper GOP VEEP or something.