[Wallace T.]

The rationale for Biden was that he was a Northeastern white Catholic (technically mid-Atlantic, but Delaware, DC, and Maryland have long ago become culturally more like the upper Northeast despite some residual Southern ways on the Eastern Shore). His purpose was to hold onto a percentage of the white Catholic vote that might have been alienated had Obama chosen, say, Elizabeth Warren or Chuck Schumer.

The dynamics of 2016 will be different from those in 2008 or 2012. I don't know if Hillary qualifies as a "pure" Northeasterner, as she grew up around Chicago, and lived for about 20 years in Arkansas until she moved to Washington, DC and later New York. However, she is old, female, and white, so it is possible if not likely that her Vice Presidential running mate will be none, or just one, of the above. Julian Castro is a possibility, although he would not carry his home state. If Jason Carter, Jimmy Carter's grandson, is elected governor of Georgia, he would become another possibility plus possibly win Georgia for the Democrats for the first time since his grandfather was elected in 1976.

[Starboard]

I don’t know if Hillary qualifies as a “pure” Northeasterner, as she grew up around Chicago, and lived for about 20 years in Arkansas until she moved to Washington, DC and later New York.

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You’re right about her history, of course, but I would add that being a U.S. senator from New York (winning election twice) contributes to her image as a Northeasterner. I don’t think many people associate her with Arkansas or Chicago anymore. That’s now ancient history. She is certainly a creature/denizen of DC though.