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. pic.twitter.com/TcnfpyBnPq

— Nate Silver (@NateSilver538) June 13, 2019