I think Biden's support among minorities will erode as it becomes more prominent his role in the 90s crime bill. I see no reason to support the man, beyond Obama good feels and risk-aversion/cynicism. Biden's establishment, deal-making history worries he may safe-guard certain constituencies prior to the primaries ala Clinton, exactly the kind of thing the Democratic party should resist after 2016. We make too much of the polls at this time, only the political junkies (like us) are paying attention, and only us are trying to thread the nuance. When the debates, and esp. the primaries start, we'll see how the candidates actually stand among the voting public. But please god not Biden.