From FiveThirtyEight.com com article by Nate Silver:

Biden, Harris and Warren represent three relatively distinct, but fairly traditional, archetypes for party nominees:
- Biden, as a former vice president, is a “next-in-line” candidate who is rather explicitly promising to perpetuate the legacy of President Obama and uphold the party’s current agenda. It might not be exciting, but these candidates have pretty good track records.
- Harris is a coalition-builder who would hope to unite the different factions of the party — black, white, left, liberal, moderate, etc. — as a consensus choice.
- Warren is offering more red meat (or should it be blue meat?) and would represent more of a leftward transformation from the status quo. But she’s simpatico enough with party elites and has broad enough appeal that she isn’t necessarily a factional candidate in the way that Sanders is. Instead, a better analogy for Warren might be Ronald Reagan; they are not comparable in terms of their backgrounds or their political styles, but they are both candidates who straddle the boundary between the ideological wings of their party and the party establishment.
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