From Charles Krauthammer's column:
There is one long-shot possibility that might upend Clinton: Biden pledges to serve one term only and chooses Elizabeth Warren as his running mate — now. One-term pledges address the age problem but they are political poison, giving the impression of impermanence and mere transition. Warren cures that, offering the Democratic base — and the Sanders constituency — the vision of a twelve-year liberal ascendancy.
When asked on Wednesday whether she had discussed such a ticket with Biden, Warren answered that "it was a long conversation" — a knowing wink in the form of a provocative non-denial.
Well, it would be nice to have a Native American on the ticket, I suppose.