One interesting group is, for lack of a better term, the Romney-Clinton vote, which probably broke big for Biden in SC. They're a big factor in open Southern primaries, but Biden will face more competition now with Bloomberg in the race. Is it a vote that doesn't abandon him?
In Super Tues. polling data that I've seen, Bloomberg had a clear advantage, at least heading into SC, among Dem primary voters who last voted in a GOP primary. That's a big group in TX/VA; it'll be an interesting test of where these voters stand in their transition to the Dems
If these voters broke for Biden, and I'd guess the ones who feel pretty comfortable voting Dem at this point would do so, then you'd see Biden quickly pick up support in the affluent areas around DC/DAL/HOU/Nashville, etc.
To this point, affluent areas haven't been amazing for Biden. He's faced lots of competition from Buttigieg, Klobuchar, and soon Bloomberg. But there's a lot of room for not-Sanders consolidation here
