Maybe they mean to trot out Cory Booker.
Cory Booker is a rising star in the Democrat party.
He and Castro from San Antonio are on the short list of VP candidates, and could well decide to run in the primaries also.
Both Booker and Castro are the right ethnicities, shall we say.
It’s quite possible that the Kerry/Edwards ticket of 2004 will be the last time that Democrats have two white men on their presidential ticket. In this era of identity politics and celebrating diversity and all that, Democrats will see candidates who “look like America”, to use that phrase, so that we have to have black, women, Latino candidates for pres. and VP from now on. If a white man is the pres. candidate, then he will face intense pressure to pick someone from the women, black, Latino group as his running mate.