Overall, the gap between Biden and the rest of the top tier has closed somewhat. This is a bit predictable in national polls (i.e. Biden's bounce has faded somewhat just like everyone else's bounce did) but IA/NH could be challenging for him even if SC/NV potentially pretty good.
@jusmas27 Nope, it doesn't make them good people. I'm just saying that retweeting someone isn't the same thing as voting for them to be president. Apples to oranges.