Could the dems be planning a brokered convention? Say Hillary has the votes for the nomination and is indicted after the primaries. She’s forced out, Sanders wouldn’t be the heir to her delegates, enter slo-joe and convention brokering.
And what about poor old Martin O'Malley, number 3 of 3, who's obviously been hanging in there waiting for Hillary to bail, so he could provide a "democrat" to support rather than an out-and-out Socialist, in the vain hope that some Democrats will care about that.